A data source has an ISO-8601 datetime field without an offset.
Example: 2019-07-09T18:45
However, I know that the time in question is understood to be in the America/Chicago
timezone.
How can I get a Luxon DateTime object of this time's equivalent in UTC?
I can do DateTime.fromISO('2019-07-09T18:45').plus({hours: 5})
... but this will only be valid during half of the year (like now) when it is daylight savings time. Otherwise the offset would be .plus({hours: 6})
Does Luxon have a date-aware (and therefore DST-aware) method for converting from a specific zoned local time to UTC?
Since you know the timezone of you input date, you can use the zone
option when parsing it. As fromISO
docs states:
public static fromISO(text: string, opts: Object): DateTime
opts.zone
: use this zone if no offset is specified in the input string itself.
Then you can use toUTC
to convert your DateTime to UTC:
"Set" the DateTime's zone to UTC. Returns a newly-constructed DateTime.
Equivalent to setZone('utc')
Here a live sample:
const DateTime = luxon.DateTime;
const d = DateTime.fromISO('2019-07-09T18:45', {zone: 'America/Chicago'});
console.log(d.toISO());
console.log(d.toUTC().toISO());
<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/global/luxon.js"></script>