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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| import { RRule } from 'rrule'; | ||
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| class ScheduleUtils { | ||
| static occursNow(rruleString, durationSeconds) { | ||
| const rrule = RRule.fromString(rruleString.replace("\\n", "\n")); | ||
| const duration = durationSeconds * 1000; | ||
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| const now = new Date(); | ||
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| // From the RRULE docs:_ "Returned "UTC" dates are always meant to be | ||
| // interpreted as dates in your local timezone. This may mean you have to | ||
| // do additional conversion to get the "correct" local time with offset | ||
| // applied." | ||
| // | ||
| // We do the opposite to ensure that datetime comparisons works as expected. | ||
| // For evaluation with the RRule library we pretend that "now" is in UTC instead of the local timezone. | ||
| // That is 9:00 in Europe/Copenhagen time will be evaluated as if it was 9:00 in UTC. | ||
| // @see https://github.com/jkbrzt/rrule#important-use-utc-dates | ||
| const nowWithoutTimezone = new Date(Date.UTC(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(), now.getMinutes(), now.getSeconds())); | ||
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| // Subtract duration from now to make sure all relevant occurrences are considered. | ||
| const from = new Date(nowWithoutTimezone.getTime() - duration); | ||
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| let occurs = false; | ||
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| // RRule.prototype.between(after, before, inc=false [, iterator]) | ||
| // The between() function expects "after" and "before" to be in pretend UTC as | ||
| // described above. | ||
| rrule.between( | ||
| from, | ||
| nowWithoutTimezone, | ||
| true, | ||
| function iterator(occurrenceDate) { | ||
| // The "ccurrenceDate" we are iterating over contains a "pretend UTC" datetime | ||
| // object. As above, if the time for "occurrenceDate" is 09:00 UTC it should be | ||
| // treated as 09:00 local time regardsless of the actual local timezone | ||
| const end = new Date(occurrenceDate.getTime() + duration); | ||
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| if (nowWithoutTimezone >= occurrenceDate && nowWithoutTimezone <= end) { | ||
| occurs = true; | ||
| // break iteration. | ||
| return false; | ||
| } | ||
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| // continue iteration. | ||
| return true; | ||
| } | ||
| ); | ||
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| return occurs; | ||
| } | ||
| } | ||
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| export default ScheduleUtils; |
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