CODEWITHSUNDEEP
javascriptdayjs
net.uk.sweet
net.uk.sweet

Reputation: 12431

Generating a 24 hour UTC date range for a timezone using dayjs

I'm trying to create a function which returns the start and end time for a given date and given timezone in UTC using dayjs. These are examples of the results I think I need:

Date Timezone Start End
2021-04-15 America/New_York 2021-04-15T04:00:00.000Z 2021-04-16T03:59:59.999Z
2021-03-27 America/New_York 2021-03-27T04:00:00.000Z 2021-03-28T03:59:59.999Z
2021-03-13 America/New_York 2021-03-13T05:00:00.000Z 2021-03-14T04:59:59.999Z

This is the function I have:

dayjs.extend(utc);
dayjs.extend(timezone);

export const getDayRange = (date, timezone = "America/New_York") => ({
  start: dayjs.tz(date, timezone).startOf("day").utc().toISOString(),
  end: dayjs.tz(date, timezone).endOf("day").utc().toISOString()
});

However, it doesn't output the results I expect and appears to be influenced by local time (since the offset with UTC shifts on the 28th of March which was the end of DST in the UK not New York). I've tried various combinations of the chained dayjs command with varying results, none correct.

This feels like it should be something which is quite straightforward with dayjs, not to mention a fairly common use-case. However, I'm struggling to get something to work.

codesandbox example with tests

Upvotes: 0

Views: 1625

Answers (1)

net.uk.sweet
net.uk.sweet

Reputation: 12431

Turns out there have been some issues with timezones in dayjs since version v.1.9.6. Fixes are expected in the next release (1.10.5?):

https://github.com/iamkun/dayjs/issues/1437

I was able to use moment instead (since the APIs are mostly the same) which resolved my issue:

export const getDayRange = (date, timezone = "America/New_York") => ({
  start: moment.tz(date, timezone).startOf("day").toISOString(),
  end: moment.tz(date, timezone).endOf("day").toISOString()
});

Upvotes: 0

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