iamkun / iamkun/dayjs

TimeZone conversion gives different output as compared to moment

Open
#2,578 0 comments 0 reactions 0 assignees View on GitHub
Dominant language
JavaScript
Stars
48.7k
Forks
2.5k
PR merge metrics
No merged PRs in 30d

Description

**Describe the bug**
I am trying shift to dayjs from moment. But I found strange behavior on timezone conversion.

```
moment.tz([ 2024, 2, 13 ], 'America/New_York').format() // "2024-03-13T00:00:00-04:00"

dayjs.tz([2024, 2, 13], 'America/New_York').format() // "2024-03-12T14:15:00-04:00"
```

These two should give same result. But why is it not same?

Contributor guide

Open the contributing guide

Research direction

Reproduce the two timezone conversion calls shown in the issue and trace the Day.js timezone conversion entry point used by dayjs.tz. Compare the resulting local date and offset with Moment's output; done means the same input produces the expected 2024-03-13T00:00:00-04:00 result.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.