97 lines
2.7 KiB
JavaScript
97 lines
2.7 KiB
JavaScript
const { getProperties } = Ember;
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/*
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DateWithZoneHelper provides a limited list of helpers
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to manipulate a moment object with timezones
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- add(count unit) adds a COUNT of UNITS to a date
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- subtract(count unit) subtracts a COUNT of UNITS to a date
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- format(format) formats a date with zone in a consistent way, optional moment format
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- isDST() allows to know if a date in a specified timezone is currently under DST
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- datetimeWithZone(timezone) returns a new moment object with timezone applied
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- datetime returns the moment object
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- unitRepetitionsBetweenDates(duration, date) return the number of repetitions of
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duration between two dates, eg for duration: "1.weeks", "2.months"...
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*/
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export default class DateWithZoneHelper {
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constructor(params = {}) {
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this.timezone = params.timezone || "UTC";
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this.localTimezone = params.localTimezone || moment.tz.guess();
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this.datetime = moment.tz(
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getProperties(params, [
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"year",
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"month",
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"day",
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"hour",
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"minute",
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"second",
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]),
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this.timezone
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);
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}
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isDST() {
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return this.datetime.tz(this.localTimezone).isDST();
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}
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unitRepetitionsBetweenDates(duration, date) {
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const [count, unit] = duration.split(".");
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// get the diff in the specified units with decimals
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const diff = Math.abs(this.datetime.diff(date, unit, true));
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// get integer count of duration in diff, eg: 4 hours diff is 2 for 2.hours duration
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const integer = Math.trunc(diff / count);
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// get fractional to define if we have to add one "duration"
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const fractional = (diff / count) % 1;
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return (
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integer * parseInt(count, 10) + (fractional > 0 ? parseInt(count, 10) : 0)
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);
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}
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add(count, unit) {
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return this._fromDatetime(
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this.datetime.clone().add(count, unit),
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this.timezone,
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this.localTimezone
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);
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}
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subtract(count, unit) {
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return this._fromDatetime(
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this.datetime.clone().subtract(count, unit),
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this.timezone,
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this.localTimezone
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);
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}
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datetimeWithZone(timezone) {
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return this.datetime.clone().tz(timezone);
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}
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format(format) {
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if (format) {
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return this.datetime.tz(this.localTimezone).format(format);
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}
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return this.datetime.tz(this.localTimezone).toISOString(true);
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}
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static fromDatetime(datetime, timezone, localTimezone) {
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return new DateWithZoneHelper({
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year: datetime.year(),
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month: datetime.month(),
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day: datetime.date(),
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hour: datetime.hour(),
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minute: datetime.minute(),
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second: datetime.second(),
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timezone,
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localTimezone,
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});
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}
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_fromDatetime(datetime, timezone, localTimezone) {
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return DateWithZoneHelper.fromDatetime(datetime, timezone, localTimezone);
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}
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}
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