UTC timestamp

[username14415]

My example timestamp: 2024-12-28 18:32:12

Code:
const utcDate = new TZDate(timestamp, "UTC");

However, it returns: Sat Dec 28 2024 17:32:12 GMT+0000 (Coordinated Universal Time)

Why not: Sat Dec 28 2024 18:32:12 GMT+0000 (Coordinated Universal Time) ?

[jawnothin]

Same issue as this #36

The issue here is because no timezone is specified it's picking up the local devices timezone, and then converting that timestamp to UTC.

[cbejensen]

As @jawnothin said, it's using local time. To prevent that, just specify a zone/offset in your timestamp (add a Z for UTC):

2024-12-28 18:32:12Z

[username14415]

Thanks, it works

  const formatMessageTimestampTZ = ({ date, timezone }) => {
    const utcTimestamp = `${date}Z`;
    const utcDate = new TZDate(utcTimestamp, "UTC");
    const tzDate = utcDate.withTimeZone(timezone);

    return tzDate;
  };

Why does it convert to the local device timezone? Wouldn't it be better to convert it to UTC by default?

[cbejensen]

I assume they were trying to keep some consistency with existing parsing norms. JS native Date assumes local time too if no zone is specified.