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import { Duration } from './duration'
export type DateMarker = Date
export const DAY_IDS = [ 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat' ]
// Adding
export function addWeeks(m: DateMarker, n: number) {
let a = dateToUtcArray(m)
a[2] += n * 7
return arrayToUtcDate(a)
}
export function addDays(m: DateMarker, n: number) {
let a = dateToUtcArray(m)
a[2] += n
return arrayToUtcDate(a)
}
export function addMs(m: DateMarker, n: number) {
let a = dateToUtcArray(m)
a[6] += n
return arrayToUtcDate(a)
}
// Diffing (all return floats)
export function diffWeeks(m0, m1) {
return diffDays(m0, m1) / 7
}
export function diffDays(m0, m1) {
return (m1.valueOf() - m0.valueOf()) / (1000 * 60 * 60 * 24)
}
export function diffHours(m0, m1) {
return (m1.valueOf() - m0.valueOf()) / (1000 * 60 * 60)
}
export function diffMinutes(m0, m1) {
return (m1.valueOf() - m0.valueOf()) / (1000 * 60)
}
export function diffSeconds(m0, m1) {
return (m1.valueOf() - m0.valueOf()) / 1000
}
export function diffDayAndTime(m0: DateMarker, m1: DateMarker): Duration {
let m0day = startOfDay(m0)
let m1day = startOfDay(m1)
return {
years: 0,
months: 0,
days: Math.round(diffDays(m0day, m1day)),
milliseconds: (m1.valueOf() - m1day.valueOf()) - (m0.valueOf() - m0day.valueOf())
}
}
// Diffing Whole Units
export function diffWholeWeeks(m0: DateMarker, m1: DateMarker): number {
let d = diffWholeDays(m0, m1)
if (d !== null && d % 7 === 0) {
return d / 7
}
return null
}
export function diffWholeDays(m0: DateMarker, m1: DateMarker): number {
if (timeAsMs(m0) === timeAsMs(m1)) {
return Math.round(diffDays(m0, m1))
}
return null
}
// Start-Of
export function startOfDay(m: DateMarker): DateMarker {
return arrayToUtcDate([
m.getUTCFullYear(),
m.getUTCMonth(),
m.getUTCDate()
])
}
export function startOfHour(m: DateMarker) {
return arrayToUtcDate([
m.getUTCFullYear(),
m.getUTCMonth(),
m.getUTCDate(),
m.getUTCHours()
])
}
export function startOfMinute(m: DateMarker) {
return arrayToUtcDate([
m.getUTCFullYear(),
m.getUTCMonth(),
m.getUTCDate(),
m.getUTCHours(),
m.getUTCMinutes()
])
}
export function startOfSecond(m: DateMarker) {
return arrayToUtcDate([
m.getUTCFullYear(),
m.getUTCMonth(),
m.getUTCDate(),
m.getUTCHours(),
m.getUTCMinutes(),
m.getUTCSeconds()
])
}
// Week Computation
export function weekOfYear(marker, dow, doy) {
let y = marker.getUTCFullYear()
let w = weekOfGivenYear(marker, y, dow, doy)
if (w < 1) {
return weekOfGivenYear(marker, y - 1, dow, doy)
}
let nextW = weekOfGivenYear(marker, y + 1, dow, doy)
if (nextW >= 1) {
return Math.min(w, nextW)
}
return w
}
function weekOfGivenYear(marker, year, dow, doy) {
let firstWeekStart = arrayToUtcDate([ year, 0, 1 + firstWeekOffset(year, dow, doy) ])
let dayStart = startOfDay(marker)
let days = Math.round(diffDays(firstWeekStart, dayStart))
return Math.floor(days / 7) + 1 // zero-indexed
}
// start-of-first-week - start-of-year
function firstWeekOffset(year, dow, doy) {
// first-week day -- which january is always in the first week (4 for iso, 1 for other)
let fwd = 7 + dow - doy
// first-week day local weekday -- which local weekday is fwd
let fwdlw = (7 + arrayToUtcDate([ year, 0, fwd ]).getUTCDay() - dow) % 7
return -fwdlw + fwd - 1
}
// Array Conversion
export function dateToLocalArray(date) {
return [
date.getFullYear(),
date.getMonth(),
date.getDate(),
date.getHours(),
date.getMinutes(),
date.getSeconds(),
date.getMilliseconds()
]
}
export function arrayToLocalDate(a) {
return new Date(
a[0],
a[1] || 0,
a[2] == null ? 1 : a[2], // day of month
a[3] || 0,
a[4] || 0,
a[5] || 0
)
}
export function dateToUtcArray(date) {
return [
date.getUTCFullYear(),
date.getUTCMonth(),
date.getUTCDate(),
date.getUTCHours(),
date.getUTCMinutes(),
date.getUTCSeconds(),
date.getUTCMilliseconds()
]
}
export function arrayToUtcDate(a) {
// according to web standards (and Safari), a month index is required.
// massage if only given a year.
if (a.length === 1) {
a = a.concat([ 0 ])
}
return new Date(Date.UTC.apply(Date, a))
}
// Other Utils
export function isValidDate(m: DateMarker) {
return !isNaN(m.valueOf())
}
export function timeAsMs(m: DateMarker) {
return m.getUTCHours() * 1000 * 60 * 60 +
m.getUTCMinutes() * 1000 * 60 +
m.getUTCSeconds() * 1000 +
m.getUTCMilliseconds()
}