Timestamp to Date
Unixタイムスタンプを読みやすい日付に変換 — ローカル時刻、UTC、ISO 8601、相対時刻。秒とミリ秒を自動検出。無料。
Date to timestamp
使い方 convert a Unix timestamp to a date
- Enter a timestamp — seconds and milliseconds are detected automatically (values above 1 trillion are treated as milliseconds).
- Read the result: local time, UTC time, ISO 8601, and relative time ("3 hours ago").
- For the reverse direction, pick a date and time and click Get Unix Timestamp.
Unix time counts the seconds since January 1, 1970 (the epoch). Databases, APIs, and JavaScript itself all use it, so converting timestamps to readable dates is an everyday developer task. Everything runs locally in your browser — nothing is uploaded.
What is epoch time?
Unix epoch time (also called Unix timestamp) is the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970. Because it is a single integer, it is easy to store, sort, and compare across systems and timezones. This tool shows you exactly what date and time any timestamp represents, in both your local timezone and UTC.
Frequently asked questions
How do I convert a Unix timestamp to a date?
Enter the timestamp in the box and press 変換 — or just start typing, since conversion is live. Local time, UTC, ISO 8601, and relative time are all shown instantly.
Is my timestamp in seconds or milliseconds?
This tool auto-detects: values greater than 1,000,000,000,000 (1e12) are treated as milliseconds, everything else as seconds. The detected unit is shown in the output.
What is epoch time?
Epoch time is the number of seconds since January 1, 1970, 00:00:00 UTC. It is the standard way computers represent moments in time, independent of timezone.
Can I convert a date back to a timestamp?
Yes — use the Date to timestamp section below the main tool, or the Timestamp 変換er for a fully bidirectional workflow.