/
date.ts
49 lines (45 loc) · 1.69 KB
/
date.ts
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import { toValue, stringify, isString, isNumber, TimezoneDate, LiquidDate, strftime, isNil } from '../util'
import { FilterImpl } from '../template'
const DEFAULT_FMT = '%A, %B %-e, %Y at %-l:%M %P %z'
export function date (this: FilterImpl, v: string | Date, format?: string, timezoneOffset?: number | string) {
const opts = this.context.opts
let date: LiquidDate
v = toValue(v)
format = toValue(format)
if (isNil(format)) format = DEFAULT_FMT
else format = stringify(format)
if (v === 'now' || v === 'today') {
date = new Date()
} else if (isNumber(v)) {
date = new Date(v * 1000)
} else if (isString(v)) {
if (/^\d+$/.test(v)) {
date = new Date(+v * 1000)
} else if (opts.preserveTimezones) {
date = TimezoneDate.createDateFixedToTimezone(v)
} else {
date = new Date(v)
}
} else {
date = v
}
if (!isValidDate(date)) return v
if (timezoneOffset !== undefined) {
date = new TimezoneDate(date, parseTimezoneOffset(date, timezoneOffset))
} else if (opts.timezoneOffset !== undefined) {
date = new TimezoneDate(date, parseTimezoneOffset(date, opts.timezoneOffset))
}
return strftime(date, format)
}
function isValidDate (date: any): date is Date {
return (date instanceof Date || date instanceof TimezoneDate) && !isNaN(date.getTime())
}
/**
* need pass in a `date` because offset is dependent on whether DST is active
*/
function parseTimezoneOffset (date: Date, timeZone: string | number) {
if (isNumber(timeZone)) return timeZone
const utcDate = new Date(date.toLocaleString('en-US', { timeZone: 'UTC' }))
const tzDate = new Date(date.toLocaleString('en-US', { timeZone }))
return (utcDate.getTime() - tzDate.getTime()) / 6e4
}