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// Methods:
// getIntlDateTimeFormatOptions, getStartOfYearInTimeZone, getWeekNumber, parseDateTime, isCurrentDate,
// getTimeZoneOffset, addToDate, addTime, toValidScale, truncateLowerScales, getStartDatetime,
// getEndDatetime,
import { Scale, DateTimeObject } from '@/types/definitions'
//import { isEmptyObject, deepMergeObjects } from './common'
/**
* Gets Intl.DateTimeFormatOptions in the specified time zone.
* You can override options by passing any property/value pairs object of the option you want
* to change as the 3rd argument.
* @param {string} timeZone
* @param {Partial<Intl.DateTimeFormatOptions> | undefined} overrideOptions
* @returns {Intl.DateTimeFormatOptions}
*/
export const getIntlDateTimeFormatOptions = (
timeZone: string = 'UTC',
overrideOptions?: Partial<Intl.DateTimeFormatOptions>
): Intl.DateTimeFormatOptions => {
const defaultOptions: Intl.DateTimeFormatOptions = {
year: 'numeric',
month: 'numeric',
day: 'numeric',
hour: 'numeric',
minute: 'numeric',
second: 'numeric',
//fractionalSecondDigits: 3,
hour12: false,
timeZone: timeZone
}
//if (!!overrideOptions && !isEmptyObject(overrideOptions)) {
if (!!overrideOptions && Object.keys(overrideOptions).length !== 0) {
//return deepMergeObjects(defaultOptions, overrideOptions) as Intl.DateTimeFormatOptions
return { ...defaultOptions, ...overrideOptions }
} else {
return defaultOptions
}
}
/**
* Gets the first date of the year in the specified time zone.
* @param {number} year
* @param {string} timeZone
* @returns {Date}
*/
export const getStartOfYearInTimeZone = (year: number, timeZone: string = 'UTC'): Date => {
const options: Intl.DateTimeFormatOptions = getIntlDateTimeFormatOptions(timeZone)
//const locale: string | undefined = undefined// or 'en-US'
const formatter = new Intl.DateTimeFormat(undefined, options)
const startOfYearStr = `${year.toString().padStart(4, '0')}-01-01T00:00:00${timeZone === 'UTC' ? '.000Z' : ''}`
const parts = formatter.formatToParts(new Date(startOfYearStr))
const dateStr = parts.map(({ value }) => value).join('') + (timeZone === 'UTC' ? '.000Z' : '')
let resultDate = new Date(dateStr)
if (year < 100) {
resultDate = new Date(timeZone === 'UTC' ? resultDate.setUTCFullYear(year) : resultDate.setFullYear(year))
//console.log('!!!:', year, startOfYearStr, new Date(startOfYearStr), parts, dateStr, resultDate)
}
return resultDate
}
/**
* Calculate the number of weeks by calculating the number of days that have passed
* since the beginning of the year and dividing it by 7.
* @param {Date} date
* @param {number | undefined} firstDayOfWeek - number of first day of week in calendar; In range from Sunday is 0 to Saturday is 6.
* @param {string | undefined} timeZone
* @returns {number}
*/
export const getWeekNumber = (date: Date, firstDayOfWeek: number = 0, timeZone: string = 'UTC'): number => {
/* */
// Calculate the day of the year in the given time zone
/*
let timeZoneOffset: number
if (date.getFullYear() < 100) {
timeZoneOffset = timeZone === 'UTC' ? 0 : getTimeZoneOffset(date, timeZone)
//const test = new Date(date.getTime() + timeZoneOffset)
//console.log('!!:', date, timeZone, timeZoneOffset, test.getUTCFullYear(), test.getFullYear())
} else {
timeZoneOffset = timeZone === 'UTC' ? 0 : (date.getTime() - new Date(date.toLocaleString(undefined, { timeZone })).getTime())
}
*/
//const timeZoneOffset = getTimeZoneOffset(date, timeZone)
let utcDate = timeZone === 'UTC'
? new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(), 0, 0, 0, 0))
: new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0, 0))
if (date.getFullYear() < 100) {
utcDate = new Date(utcDate.setUTCFullYear(date.getFullYear()))
}
// Get the start of the year in the given time zone
const startOfYear = getStartOfYearInTimeZone(utcDate.getUTCFullYear(), 'UTC')
//const startOfYear = getStartOfYearInTimeZone(timeZone === 'UTC' ? localDate.getUTCFullYear() : localDate.getFullYear(), timeZone)
const startDayOfWeek = startOfYear.getUTCDay()
//const startDayOfWeek = timeZone === 'UTC' ? startOfYear.getUTCDay() : startOfYear.getDay()
const pastDaysOfYear = Math.floor((utcDate.getTime() - startOfYear.getTime()) / (24 * 60 * 60 * 1000)) + 1
//const firstWeekDayOffset = (7 + (firstDayOfWeek - startDayOfWeek)) % 7
const firstWeekDayOffset = (7 + (startDayOfWeek - firstDayOfWeek)) % 7
const adjustedDayOfYear = pastDaysOfYear + firstWeekDayOffset
// Calculate the week number
const weekNumber = Math.ceil(adjustedDayOfYear / 7)
//console.log('getWeekNumber:', utcDate.toISOString(), startOfYear.toISOString(), startDayOfWeek, pastDaysOfYear, firstWeekDayOffset, adjustedDayOfYear, weekNumber)
/*
const timeZoneOffset = getTimeZoneOffset(date, timeZone)
const localDate = new Date(date.getTime() - timeZoneOffset)
const startOfYear = getStartOfYearInTimeZone(localDate.getFullYear(), timeZone)
const startDayOfWeek = startOfYear.getUTCDay()
const dayOfYear = Math.floor((localDate.getTime() - startOfYear.getTime()) / (24 * 60 * 60 * 1000)) + 1
const firstWeekDayOffset = (7 + (firstDayOfWeek - startDayOfWeek)) % 7
const adjustedDayOfYear = dayOfYear + firstWeekDayOffset
const weekNumber = Math.ceil(adjustedDayOfYear / 7)
*/
return weekNumber
}
/**
* Determine whether a date/time string is in a recommended format, including ISO 8601 format.
*
* @param {string} dateString
* @returns
*/
export const isValidISOStrings = (dateString: string): boolean => {
//const dateRegex = /^(\d{4}-\d{2}-\d{2}(?:T\d{2}:\d{2}(?::\d{2}(?:\.\d{1,3})?)?(?:Z|[+-]\d{2}:\d{2})?)?)|(\d{2}\/\d{2}\/\d{4}(?: \d{2}:\d{2}(?::\d{2})?)?)$/
const dateRegex = /^([+-]?\d{1,4}[-\/]\d{1,2}[-\/]\d{1,2}(?:[T\s]\d{1,2}:\d{1,2}(?::\d{1,2}(?:\.\d{1,3})?)?(?:Z|[+-]\d{1,2}:\d{1,2})?)?)$/
return dateRegex.test(dateString)
}
/**
* Retrives an object with datetime elements from a specified datetime string, number, or datetime object.
*
* @param {string | number | Date} dateTime
* @param {string | undefined} timeZone
* @param {string[] | undefined} monthNames
* @param {string[] | undefined} dayNames
* @param {number | undefined} firstDayOfWeek - number of first day of week in calendar; In range from Sunday is 0 to Saturday is 6.
* @param {string | undefined} locale
* @returns {DateTimeObject}
*/
export const parseDateTime = (
dateTime: string | number | Date,
timeZone?: string,
monthNames?: string[],
dayNames?: string[],
firstDayOfWeek: number = 0,
locale?: string
): DateTimeObject | null => {
// Based "dateObject" must be UTC datetime.
let dateObject: Date
let isGivenUTC: boolean = false
let _localDate: Date
if (typeof dateTime === 'string') {
//console.log('parseDateTime::1:', isValidISOStrings(dateTime))
if (isValidISOStrings(dateTime)) {
// Date strings matched includes ISO 8601 format.
const matches = /^((?<_y>[+-]?\d{1,4})[-\/](?<_m>\d{1,2})[-\/](?<_d>\d{1,2})(?:[T\s](?<_h>\d{1,2}):(?<_mi>\d{1,2})(?::(?<_s>\d{1,2})(?:\.(?<_ms>\d{1,3}))?)?(?:(?<_utc>Z)|(?<_tzo>[+-]\d{1,2}:\d{1,2}))?)?)$/.exec(dateTime)
if (matches?.groups && matches?.length > 0) {
isGivenUTC = !!matches.groups._utc
//console.log('!!!:', dateTime, matches.groups, isGivenUTC, matches.groups._y.length)
if (matches.groups._y.length > 2) {
dateObject = new Date(Date.UTC(Number(matches.groups._y), Number(matches.groups._m) - 1, Number(matches.groups._d), Number(matches.groups._h || 0), Number(matches.groups._mi || 0), Number(matches.groups._s || 0), Number(matches.groups._ms || 0)))
} else {
dateObject = new Date(Date.UTC(100, Number(matches.groups._m) - 1, Number(matches.groups._d), Number(matches.groups._h || 0), Number(matches.groups._mi || 0), Number(matches.groups._s || 0), Number(matches.groups._ms || 0)))
dateObject.setUTCFullYear(Number(matches.groups._y))
//console.log('parseDateTime::2-1:', matches.groups, isGivenUTC, dateObject)
}
}
} else {
// Other format of date strings. Treated as a datetime in local timezone.
_localDate = new Date(dateTime)
dateObject = new Date(Date.UTC(_localDate.getFullYear(), _localDate.getMonth(), _localDate.getDate(), _localDate.getHours(), _localDate.getMinutes(), _localDate.getSeconds(), _localDate.getMilliseconds()))
//dateObject = new Date(Date.UTC(_localDate.getUTCFullYear(), _localDate.getUTCMonth(), _localDate.getUTCDate(), _localDate.getUTCHours(), _localDate.getUTCMinutes(), _localDate.getUTCSeconds(), _localDate.getUTCMilliseconds()))
//console.log('parseDateTime::2-2:', _localDate, isGivenUTC, dateObject)
}
} else if (typeof dateTime === 'number' && !Number.isNaN(dateTime)) {
// Constructed datetime from a timestamp is always UTC.
dateObject = new Date(dateTime)
isGivenUTC = true
//console.log('parseDateTime::2-3:', dateTime, isGivenUTC, dateObject.toISOString(), dateObject.getTime())
} else if (dateTime instanceof Date) {
// Treated as a datetime in local timezone, then convert to UTC.
_localDate = dateTime
dateObject = new Date(Date.UTC(_localDate.getUTCFullYear(), _localDate.getUTCMonth(), _localDate.getUTCDate(), _localDate.getUTCHours(), _localDate.getUTCMinutes(), _localDate.getUTCSeconds(), _localDate.getUTCMilliseconds()))
if (_localDate.getUTCFullYear() < 100) {
dateObject.setUTCFullYear(_localDate.getUTCFullYear())
}
isGivenUTC = true
} else {
return null
}
if (Number.isNaN(dateObject!.getTime())) {
// When cannot parse given date strings, or other exception case.
return null
}
// Set default values
if (!timeZone || timeZone === '') {
timeZone = 'UTC'
}
if (!monthNames || !Array.isArray(monthNames) || monthNames.length == 0) {
monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
}
if (!dayNames || !Array.isArray(dayNames) || dayNames.length == 0) {
dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
}
const timeZoneOffset = getTimeZoneOffset(dateObject!, timeZone) || 0
const offsetHours = Math.floor(timeZoneOffset / (60 * 60 * 1000)) || 0
const offsetMinutes = Math.floor((timeZoneOffset - (offsetHours * 60 * 60 * 1000)) / (60 * 1000)) || 0
const localDate = new Date(dateObject!.getTime() + (isGivenUTC ? timeZoneOffset : 0))
//console.log('parseDateTime::3:', dateObject!, timeZone, timeZoneOffset, offsetHours, offsetMinutes, localDate)
const options: Intl.DateTimeFormatOptions = getIntlDateTimeFormatOptions(timeZone)
const formatter = new Intl.DateTimeFormat(locale, options)
const dateString = formatter.format(dateObject!) // depended given timeZone
//console.log('parseDateTime::4:', dateObject!, timeZone, dateString)
const [date, time] = dateString.split(' ')
const [year, month, day] = date.split('/')
const [hours, minutes, seconds] = time.split(':')
const fixedHours = parseInt(hours, 10) - (isGivenUTC ? 0 : offsetHours)
const fixedMinutes = parseInt(minutes, 10) - (isGivenUTC ? 0 : offsetMinutes)
const monthname = monthNames[Number(month) - 1]
const weeks = getWeekNumber(dateObject!, firstDayOfWeek, timeZone)
const weekday = timeZone === 'UTC' ? dayNames[dateObject!.getUTCDay()] : dayNames[dateObject!.getDay()]
const milliseconds = timeZone === 'UTC' ? dateObject!.getUTCMilliseconds() : dateObject!.getMilliseconds()
let ISOFormatString = dateObject!.toISOString()
let unixTimeStamp = Math.floor(dateObject!.getTime() / 1000)
if (timeZone !== 'UTC') {
const tzOffsetString = `${(offsetHours < 0 ? '-' : '+')}${String(Math.abs(offsetHours)).padStart(2, '0')}:${String(Math.abs(offsetMinutes)).padStart(2, '0')}`
ISOFormatString = localDate.toISOString().replace('Z', tzOffsetString)
//console.log('parseDateTime::3:', timeZone, ISOFormatString, dateString, localDate.toISOString(), tzOffsetString)
unixTimeStamp = Math.floor(new Date(ISOFormatString).getTime() / 1000)
}
/*
const unixEpochDate = timeZone === 'UTC'
? new Date(Date.UTC(Number(year), Number(month) - 1, Number(day), Number(hours), Number(minutes), Number(seconds)))
: new Date(Number(year), Number(month) - 1, Number(day), Number(hours), Number(minutes), Number(seconds))
const unixTimeStamp = Math.floor(unixEpochDate.getTime() / 1000)
*/
//const unixTimeStamp = timeZone === 'UTC' ? Math.floor(dateObject!.getTime() / 1000) : Math.floor(localDate.getTime() / 1000)
const ceEpochTime = unixTimeStamp + 62135596800// unit sec.
//console.log(unixTimeStamp, ceEpochTime)
return {
year: parseInt(year, 10),
month: parseInt(month, 10),
monthName: monthname,
day: parseInt(day, 10),
weekday: weekday,
weeks: weeks,
hours: fixedHours,
minutes: fixedMinutes,
seconds: parseInt(seconds, 10),
milliseconds: milliseconds,
//ISO: unixEpochDate.toISOString(),// always UTC datetime
ISO: ISOFormatString,
ts: unixTimeStamp,
cept: ceEpochTime,
y: (digit: number = 4) => String(parseInt(year, 10)).padStart(digit, '0'),
m: (digit: number = 2) => String(parseInt(month, 10)).padStart(digit, '0'),
mn:(digit: number = 0, addPeriod: boolean = false) => { return (digit == 0
? monthname : monthname.substring(0, digit) + (addPeriod && digit < monthname.length ? '.' : ''))},
d: (digit: number = 2) => String(parseInt(day, 10)).padStart(digit, '0'),
w: (digit: number = 2) => String(weeks).padStart(digit, '0'),
wd:(digit: number = 0, addPeriod: boolean = false) => { return (digit == 0
? weekday : weekday.substring(0, digit) + (addPeriod && digit < weekday.length ? '.' : ''))},
h: (digit: number = 2) => String(fixedHours).padStart(digit, '0'),
mi:(digit: number = 2) => String(fixedMinutes).padStart(digit, '0'),
s: (digit: number = 2) => String(parseInt(seconds, 10)).padStart(digit, '0'),
ms:(digit: number = 3) => String(milliseconds).padStart(digit, '0'),
}
}
/**
* Determines whether the specified date format string matches the current date.
*
* @param {string} dateString
* @param {RegExp | null} patternRegExp c.f. "/(?<year>\d+)[-\/](?<month>\d+)[-\/](?<day>\d+)(.*)$/g", "/(?<month>\d+)月(?<day>\d+)日/g"
* @param {boolean} asUTC whether handle given date string as UTC datetime; default to true
* @returns {boolean}
*/
export const isCurrentDate = (dateString: string, patternRegExp: RegExp | null = null, asUTC: boolean = true): boolean => {
let currentDate = new Date() // local timezone datetime
currentDate = asUTC
? new Date(Date.UTC(currentDate.getUTCFullYear(), currentDate.getUTCMonth(), currentDate.getUTCDate(), currentDate.getUTCHours(), currentDate.getUTCMinutes(), currentDate.getUTCSeconds(), 0))
: new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate(), currentDate.getHours(), currentDate.getMinutes(), currentDate.getSeconds(), 0)
const currentDateValue = currentDate.valueOf() // same `Date.getTime()` method
let year: number | string = 0
let month: number | string = 0
let day: number | string = 0
let hours: number | string = 0
let minutes: number | string = 0
let seconds: number | string = 0
try {
if (!patternRegExp) {
const dateObject = new Date(dateString)
if (isNaN(dateObject.getTime())) {
throw new Error('Invalid date')
}
year = asUTC ? dateObject.getUTCFullYear() : dateObject.getFullYear()
month = asUTC ? dateObject.getUTCMonth() + 1 : dateObject.getMonth() + 1
day = asUTC ? dateObject.getUTCDate() : dateObject.getDate()
hours = asUTC ? dateObject.getUTCHours() : dateObject.getHours()
minutes = asUTC ? dateObject.getUTCMinutes() : dateObject.getMinutes()
seconds = asUTC ? dateObject.getUTCSeconds() : dateObject.getSeconds()
} else {
const flags = patternRegExp.flags || ''
const globalPatternRegExp = new RegExp(patternRegExp.source, flags.includes('g') ? flags : flags + 'g')
const matches = Array.from(dateString.matchAll(globalPatternRegExp))
if (!matches || !matches[0].groups) {
throw new Error('Pattern unmatched')
}
({ year, month, day, hours, minutes, seconds } = matches[0].groups)
year = !!year ? parseInt(year, 10) : (asUTC ? currentDate.getUTCFullYear() : currentDate.getFullYear())
month = !!month ? parseInt(month, 10) : (asUTC ? currentDate.getUTCMonth() + 1 : currentDate.getMonth() + 1)
day = !!day ? parseInt(day, 10) : (asUTC ? currentDate.getUTCDate() : currentDate.getDate())
hours = !!hours ? parseInt(hours, 10) : (asUTC ? currentDate.getUTCHours() : currentDate.getHours())
minutes = !!minutes ? parseInt(minutes, 10) : (asUTC ? currentDate.getUTCMinutes() : currentDate.getMinutes())
seconds = !!seconds ? parseInt(seconds, 10) : (asUTC ? currentDate.getUTCSeconds() : currentDate.getSeconds())
}
//console.log('!!:', dateString, patternRegExp, asUTC ? 'UTC' : 'local', year, month, day, hours, minutes, seconds)
if (isNaN(year) || isNaN(month) || isNaN(day) || isNaN(hours) || isNaN(minutes) || isNaN(seconds)) {
throw new Error('Invalid date components')
}
const targetDate = asUTC
? new Date(Date.UTC(year, month - 1, day, hours, minutes, seconds, 0))
: new Date(year, month - 1, day, hours, minutes, seconds, 0)
const targetDateValue = targetDate.valueOf()
//console.log('!!!:', currentDate, targetDate, currentDateValue, targetDateValue, currentDateValue === targetDateValue)
return currentDateValue === targetDateValue
} catch (error: unknown) {
console.error('Failed to parse date in isCurrentDate():', error instanceof Error ? error.message : error)
return false
}
}
/**
* Obtain time zone offset using Intl.DateTimeFormat API.
*
* @param {Date} date -
* @param {string} timeZone -
* @returns {number}
*/
export const getTimeZoneOffset = (date: Date, timeZone: string): number => {
const options = { timeZone, year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit' } as const
const formatter = new Intl.DateTimeFormat([], options)
const parts = formatter.formatToParts(date)
const yearPart = parts.find(part => part.type === 'year')
const monthPart = parts.find(part => part.type === 'month')
const dayPart = parts.find(part => part.type === 'day')
const hourPart = parts.find(part => part.type === 'hour')
const minutePart = parts.find(part => part.type === 'minute')
const secondPart = parts.find(part => part.type === 'second')
if (!yearPart || !monthPart || !dayPart || !hourPart || !minutePart || !secondPart) {
throw new Error(`Invalid time zone specified: ${timeZone}`)
}
const localTimeString = `${yearPart.value.padStart(4, '0')}-${monthPart.value}-${dayPart.value}T${hourPart.value}:${minutePart.value}:${secondPart.value}`
const utcTimeString = date.toISOString().substring(0, 19)
const localTime = Date.parse(`${localTimeString}Z`)
const utcTime = Date.parse(`${utcTimeString}Z`)
return localTime - utcTime
}
type TimeUnit = 'years' | 'months' | 'weeks' | 'days' | 'hours' | 'minutes' | 'seconds' | 'milliseconds';
/**
* Adds time in years, months, days, hours, minutes, seconds, and milliseconds.
*
* @param {Date} date -
* @param {number} amount -
* @param {TimeUnit} unit -
* @returns {Date}
*/
export const addToDate = (date: Date, amount: number, unit: TimeUnit): Date => {
const newDate = new Date(date)
switch (unit) {
case 'years':
newDate.setUTCFullYear(newDate.getUTCFullYear() + amount)
break
case 'months':
newDate.setUTCMonth(newDate.getUTCMonth() + amount)
break
case 'weeks':
newDate.setUTCDate(newDate.getUTCDate() + amount * 7)
break
case 'days':
newDate.setUTCDate(newDate.getUTCDate() + amount)
break
case 'hours':
newDate.setUTCHours(newDate.getUTCHours() + amount)
break
case 'minutes':
newDate.setUTCMinutes(newDate.getUTCMinutes() + amount)
break
case 'seconds':
newDate.setUTCSeconds(newDate.getUTCSeconds() + amount)
break
case 'milliseconds':
newDate.setUTCMilliseconds(newDate.getUTCMilliseconds() + amount)
break
}
return newDate
}
/**
* Treats the underlying timestamp as a UTC time and calculates the specified timezone offset.
* Calculate the local time by applying the time zone offset and add the required amount.
* It then converts back to UTC time and returns a timestamp.
*
* @param {number} baseTimestamp -
* @param {number} amount -
* @param {TimeUnit | string} unit -
* @param {string} timeZone -
* @returns {number}
*/
export const addTime = (baseTimestamp: number, amount: number, unit: TimeUnit | string, timeZone: string = 'UTC'): number => {
// Get the standard UTC time.
const baseDate = new Date(baseTimestamp)
// Calculate time zone offset.
const timeZoneOffset = getTimeZoneOffset(baseDate, timeZone) || 0
// Local time with time zone offset applied.
const localBaseDate = new Date(baseDate.getTime() - timeZoneOffset)
//console.log('addTime!!!:', baseTimestamp, amount, unit, timeZone, baseDate.toISOString(), timeZoneOffset, localBaseDate)
// Add increase amount.
const filteredUnit = (!/.+s$/.test(unit) ? unit + 's' : unit) as TimeUnit
const updatedLocalDate = addToDate(localBaseDate, amount, filteredUnit)
// Convert time zone offset back to UTC time.
const updatedUtcDate = new Date(updatedLocalDate.getTime() + timeZoneOffset)
//console.log('addTime:', baseTimestamp, amount, unit, timeZone, timeZoneOffset, updatedLocalDate, updatedUtcDate)
// return timestamp.
return updatedUtcDate.getTime()
}
/**
* Converts an ambiguous scale string to a system-safe scale string.
* @param {Scale | string} scale - Candidate strings representing scale.
* @returns {string | boolean} - Invalid scale returns boolean false.
*/
export const toValidScale = (scale: Scale | string): string | boolean => {
let scaleStr = String(scale).toLowerCase()
scaleStr = /s$/i.test(scaleStr) ? scaleStr.slice(0, -1) : scaleStr
if (scaleStr !== '' && /^(year|month|(week|)(day|)|hour|minute|(milli|)second)$/.test(scaleStr)) {
return scaleStr
} else {
return false
}
}
/**
* Truncates the datetime below the specified scale of the target Date object.
* @param {Date} datetime
* @param {string} timeZone
* @param {Scale} scale
* @returns {Date}
*/
export const truncateLowerScales = (datetime: Date, timeZone: string, scale: Scale): Date => {
switch(scale) {
case 'year':
if (timeZone === 'UTC') {
datetime.setUTCMonth(0, 1)
datetime.setUTCHours(0, 0, 0, 0)
} else {
datetime.setMonth(0, 1)
datetime.setHours(0, 0, 0, 0)
}
break
case 'month':
if (timeZone === 'UTC') {
datetime.setUTCDate(1)
datetime.setUTCHours(0, 0, 0, 0)
} else {
datetime.setDate(1)
datetime.setHours(0, 0, 0, 0)
}
break
case 'week':
case 'weekday':
case 'day':
if (timeZone === 'UTC') {
datetime.setUTCHours(0, 0, 0, 0)
} else {
datetime.setHours(0, 0, 0, 0)
}
break
case 'hour':
if (timeZone === 'UTC') {
datetime.setUTCMinutes(0, 0, 0)
} else {
datetime.setMinutes(0, 0, 0)
}
break
case 'minute':
if (timeZone === 'UTC') {
datetime.setUTCSeconds(0, 0)
} else {
datetime.setSeconds(0, 0)
}
break
case 'second':
if (timeZone === 'UTC') {
datetime.setUTCMilliseconds(0)
} else {
datetime.setMilliseconds(0)
}
break
case 'millisecond':
break
}
return datetime
}
//export type SetStartDatatimeReturnType = ReturnType<typeof getStartDatetime>;
/**
* Optimize the start datetime given for the Sunorhc.Timeline, then retrieve.
* Generates Date object along the given timezone and scale if specified "currently".
*
* @param {string | Date} startDate - String of "currently", Date object, or a datetime string that can be instantiated as a Date object.
* @param {string} timeZone - String of timezone.
* @param {Scale | string} scale - As the global scale of the timeline, and scales below this are initialized to the 0 position.
* @returns {Date | Error}
*/
export const getStartDatetime = (startDate: string | Date, timeZone: string, scale: Scale | string): Date | Error => {
const scaleStr: string | boolean = toValidScale(scale)
if (!scaleStr) {
return new Error(`An unsupported scale was specified: "${scale}"`)
}
let fixedStartDatetime: Date
if (typeof startDate === 'string') {
if (startDate.toLowerCase() === 'currently') {
const currentDate = new Date()// Note: local timezone date
let currentlyStartDate: Date
if (timeZone === 'UTC') {
currentlyStartDate = new Date(Date.UTC(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate(), currentDate.getHours(), currentDate.getMinutes(), currentDate.getSeconds(), currentDate.getMilliseconds()))
//currentlyStartDate = new Date(Date.UTC(currentDate.getUTCFullYear(), currentDate.getUTCMonth(), currentDate.getUTCDate(), currentDate.getUTCHours(), currentDate.getUTCMinutes(), currentDate.getUTCSeconds(), currentDate.getUTCMilliseconds()))
} else {
//currentlyStartDate = new Date(currentDate.getTime())
currentlyStartDate = currentDate
}
const reverseOffset: { [key in Scale]: number; } = {
year: 5,// An amount of years equal to half of decade.
month: 6,// An amount of months equal to half year.
week: 26,// An amount of weeks equal to about half max week numbers in a year.
weekday: 15,// An amount of days equal to half of average days (30.4375) in a month.
day: 15,// An amount of days equal to half of average days (30.4375) in a month.
hour: 12,// An amount of hours equal to a half day with excluding daylight saving time etc.
minute: 30,// An amount of minutes equal to half hour.
second: 30,// An amount of seconds equal to half minute.
millisecond: 500,// An amount of milliseconds equal to half of a second.
}
switch(scaleStr) {
case 'year':
timeZone === 'UTC'
? currentlyStartDate.setUTCFullYear(currentDate.getFullYear() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCFullYear()`.
: currentlyStartDate.setFullYear(currentDate.getFullYear() - reverseOffset[scaleStr])
break
case 'month':
timeZone === 'UTC'
? currentlyStartDate.setUTCMonth(currentDate.getMonth() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCMonth()`.
: currentlyStartDate.setMonth(currentDate.getMonth() - reverseOffset[scaleStr])
break
case 'week':
timeZone === 'UTC'
? currentlyStartDate.setUTCDate(currentDate.getDate() - (reverseOffset[scaleStr] * 7)) // Note: does not decrease from `getUTCDate()`.
: currentlyStartDate.setUTCDate(currentDate.getDate() - (reverseOffset[scaleStr] * 7))
break
case 'weekday':
case 'day':
timeZone === 'UTC'
? currentlyStartDate.setUTCDate(currentDate.getDate() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCDate()`.
: currentlyStartDate.setDate(currentDate.getDate() - reverseOffset[scaleStr])
break
case 'hour':
timeZone === 'UTC'
? currentlyStartDate.setUTCHours(currentDate.getHours() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCHours()`.
: currentlyStartDate.setHours(currentDate.getHours() - reverseOffset[scaleStr])
break
case 'minute':
timeZone === 'UTC'
? currentlyStartDate.setUTCMinutes(currentDate.getMinutes() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCMinutes()`.
: currentlyStartDate.setMinutes(currentDate.getMinutes() - reverseOffset[scaleStr])
break
case 'second':
timeZone === 'UTC'
? currentlyStartDate.setUTCSeconds(currentDate.getSeconds() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCSeconds()`.
: currentlyStartDate.setUTCSeconds(currentDate.getSeconds() - reverseOffset[scaleStr])
break
case 'millisecond':
timeZone === 'UTC'
? currentlyStartDate.setUTCMilliseconds(currentDate.getMilliseconds() - reverseOffset[scaleStr]) // Note: does not decrease from `getUTCMilliseconds()`.
: currentlyStartDate.setMilliseconds(currentDate.getMilliseconds() - reverseOffset[scaleStr])
break
default:
return new Error(`An unsupported scale was specified: "${scale}"`)
}
//console.log('setStartDatetime:', optionStartDate, optionScale, currentlyStartDate)
fixedStartDatetime = currentlyStartDate
} else {
// When the string is not "currently".
let givenDatetime: Date
let isUtcDate: boolean = false
if (/Z|([+-]\d{2}:\d{2})$/.test(startDate)) {
// Handle as UTC datetime
givenDatetime = new Date(startDate)
isUtcDate = true
} else {
// Handle as local timezone datetime
givenDatetime = new Date(startDate)
isUtcDate = false
}
if (isNaN(givenDatetime.getTime())) {
return new Error(`Invalid date strings given: "${startDate}"`)
}
if (timeZone === 'UTC') {
fixedStartDatetime = isUtcDate
? givenDatetime
: new Date(Date.UTC(givenDatetime.getUTCFullYear(), givenDatetime.getUTCMonth(), givenDatetime.getUTCDate(), givenDatetime.getUTCHours(), givenDatetime.getUTCMinutes(), givenDatetime.getUTCSeconds(), givenDatetime.getUTCMilliseconds()))
} else {
fixedStartDatetime = !isUtcDate
? givenDatetime
: new Date(Date.UTC(givenDatetime.getFullYear(), givenDatetime.getMonth(), givenDatetime.getDate(), givenDatetime.getHours(), givenDatetime.getMinutes(), givenDatetime.getSeconds(), givenDatetime.getMilliseconds()))
}
}
} else {
if (!(startDate instanceof Date) || isNaN(startDate.getTime())) {
return new Error(`Invalid Date object given`)
}
fixedStartDatetime = startDate
}
// Truncate lower scales of start datetime depended on given global scale.
return truncateLowerScales(fixedStartDatetime, timeZone, scaleStr as Scale)
}
//export type SetEndDatatimeReturnType = ReturnType<typeof getEndDatetime>;
/**
* Optimizes the given end date and time for a timeline component.
* Mainly generates end date and time objects "auto" along the specified scale.
*
* @param {string | Date} endDate - String of "auto", Date object, or a datetime string that can be instantiated as a Date object.
* @param {string} timeZone - String of timezone.
* @param {string} scale - As the global scale of the timeline, and scales below this are initialized to the 0 position.
* @param {Date | undefined} startDate - Required when optionScale is "auto".
* @returns {Date | Error}
*/
export const getEndDatetime = (endDate: string | Date, timeZone: string, scale: string, startDate?: Date): Date | Error => {
const scaleStr: string | boolean = toValidScale(scale)
if (!scaleStr) {
return new Error(`An unsupported scale was specified: "${scale}"`)
}
let fixedEndDatetime: Date
if (typeof endDate === 'string') {
if (endDate.toLowerCase() === 'auto') {
if (!(startDate instanceof Date)) {
return new Error('Invalid Date object given start date.')
}
const autoEndDate = new Date(startDate.getTime())// Note: UTC date
const increaseOffset: { [key in Scale]: number; } = {
year: 10,// Decade years from start year.
month: 12,// An amount of months equal to a year.
week: 52,// An amount of weeks equal to max week numbers in a year.
weekday: 30,// An amount of days equal to average days (30.4375) in a month.
day: 30,// An amount of days equal to average days (30.4375) in a month.
hour: 24,// An amount of hours equal to a day with excluding daylight saving time etc.
minute: 60,// An amount of minutes equal to a hour.
second: 60,// An amount of seconds equal to a minute.
millisecond: 1000,// An amount of milliseconds equal to a second.
}
switch(scaleStr) {
case 'year':
timeZone === 'UTC'
? autoEndDate.setUTCFullYear(startDate.getUTCFullYear() + increaseOffset[scaleStr])
: autoEndDate.setFullYear(startDate.getFullYear() + increaseOffset[scaleStr])
break
case 'month':
timeZone === 'UTC'
? autoEndDate.setUTCMonth(startDate.getUTCMonth() + increaseOffset[scaleStr])
: autoEndDate.setMonth(startDate.getMonth() + increaseOffset[scaleStr])
break
case 'week':
timeZone === 'UTC'
? autoEndDate.setUTCDate(startDate.getUTCDate() + (increaseOffset[scaleStr] * 7))
: autoEndDate.setDate(startDate.getDate() + (increaseOffset[scaleStr] * 7))
break
case 'weekday':
case 'day':
timeZone === 'UTC'
? autoEndDate.setUTCDate(startDate.getUTCDate() + increaseOffset[scaleStr])
: autoEndDate.setDate(startDate.getDate() + increaseOffset[scaleStr])
break
case 'hour':
timeZone === 'UTC'
? autoEndDate.setUTCHours(startDate.getUTCHours() + increaseOffset[scaleStr])
: autoEndDate.setHours(startDate.getHours() + increaseOffset[scaleStr])
break
case 'minute':
timeZone === 'UTC'
? autoEndDate.setUTCMinutes(startDate.getUTCMinutes() + increaseOffset[scaleStr])
: autoEndDate.setMinutes(startDate.getMinutes() + increaseOffset[scaleStr])
break
case 'second':
timeZone === 'UTC'
? autoEndDate.setUTCSeconds(startDate.getUTCSeconds() + increaseOffset[scaleStr])
: autoEndDate.setSeconds(startDate.getSeconds() + increaseOffset[scaleStr])
break
case 'millisecond':
timeZone === 'UTC'
? autoEndDate.setUTCMilliseconds(startDate.getUTCMilliseconds() + increaseOffset[scaleStr])
: autoEndDate.setMilliseconds(startDate.getMilliseconds() + increaseOffset[scaleStr])
break
}
//console.log('setEndDatetime:', optionEndDate, optionScale, autoEndDate)
fixedEndDatetime = new Date(autoEndDate.getTime() - 1)
} else {
// When the string is not "auto".
let givenDatetime: Date
let isUtcDate: boolean = false
if (/Z|([+-]\d{2}:\d{2})$/.test(endDate)) {
// Handle as UTC datetime
givenDatetime = new Date(endDate)
isUtcDate = true
} else {
// Handle as local timezone datetime
givenDatetime = new Date(endDate)
isUtcDate = false
}
if (isNaN(givenDatetime.getTime())) {
return new Error(`Invalid date strings given: "${endDate}"`)
}
if (timeZone === 'UTC') {
fixedEndDatetime = isUtcDate
? givenDatetime
: new Date(Date.UTC(givenDatetime.getUTCFullYear(), givenDatetime.getUTCMonth(), givenDatetime.getUTCDate(), givenDatetime.getUTCHours(), givenDatetime.getUTCMinutes(), givenDatetime.getUTCSeconds(), givenDatetime.getUTCMilliseconds()))
} else {
fixedEndDatetime = !isUtcDate
? givenDatetime
: new Date(Date.UTC(givenDatetime.getFullYear(), givenDatetime.getMonth(), givenDatetime.getDate(), givenDatetime.getHours(), givenDatetime.getMinutes(), givenDatetime.getSeconds(), givenDatetime.getMilliseconds()))
}
}
} else {
if (!(endDate instanceof Date) || isNaN(endDate.getTime())) {
return new Error(`Invalid Date object given`)
}
fixedEndDatetime = endDate
}
return fixedEndDatetime
// Truncate lower scales of end datetime depended on given global scale.
//return truncateLowerScales(fixedEndDatetime, timeZone, scaleStr as Scale)
}
|