ガイド
APIのタイムスタンプを読みやすい日付に変換する方法
生のtimestampを実用的な日付表示へ変換する基本手順を紹介します。
APIレスポンスはtimestamp形式のことが多く、表示前の変換が必要です。単位とタイムゾーン確認が最優先です。
Start by confirming timestamp unit
Check if the value is in seconds or milliseconds before conversion.
Using the wrong unit creates meaningless dates.
Apply timezone intentionally
Readable output depends on timezone choice.
Decide whether you need UTC, server time, or user-local time.
Use one sample value to validate
Pick one timestamp with a known real-world time and compare conversion output.
This catches unit and timezone issues quickly.
- Confirm expected year.
- Check hour offset.
- Verify daylight saving periods if relevant.
Standardize display format
Use one consistent date format in your UI and logs.
Consistency reduces confusion across teams and locales.
When to use this
- Inspecting API responses.
- Building dashboards.
- Formatting logs.
- Showing dates in admin tools.
Convert with context
Always convert with the correct unit and timezone, then validate one known sample value.