Does the tool use seconds or milliseconds?

You can use either. Whole numbers with absolute value below 100,000,000,000 are treated as seconds; larger magnitudes are treated as milliseconds. Outputs always show both seconds and milliseconds.

What timezone are the date fields?

The numeric year/month/day/hour/minute/second fields are interpreted in your local timezone. ISO strings are parsed according to standard JavaScript Date rules (Z or offsets apply when present).

What do the quick action buttons do?

Now fills the current instant. Start of today sets local midnight for the current day. Start of year sets January 1 at 00:00:00 local time for the current year.

Why does the current time keep changing?

The live clock updates every second so you can copy a fresh Unix timestamp while testing APIs or logs.

时间戳转换

Unix 时间与日期互转，带实时时钟

Current time

Unix (seconds)1777753312

Unix (milliseconds)1777753312192

Local: Sat May 02 2026 20:21:52 GMT+0000 (Coordinated Universal Time)

Timestamp → date

Enter a Unix value. Values with absolute magnitude ≥ 100,000,000,000 are treated as milliseconds; smaller integers as seconds.

Date → timestamp

Fill local date/time fields, or paste an ISO 8601 string (ISO takes precedence when non-empty).

ISO 8601 string

Year

Month

Day

Hour

Minute

Second

Convert Unix timestamps to dates and back, with a live clock

Logs, databases, and APIs love Unix timestamps; humans don't. A timestamp converter handles both directions — epoch seconds or milliseconds in, ISO and human-readable dates out, plus the reverse — and shows the current time as a live clock so you can grab a fresh value while debugging.

Use the converter when you need to

Read a timestamp from a log line

Paste epoch seconds or milliseconds and instantly see the date in your local timezone and UTC.

Construct a test value for an API

Build a date in human form and copy the corresponding Unix timestamp for use in a request body.

Check token expiry by hand

Decode a JWT, copy the exp claim, and convert it to a real date to confirm whether the token is expired.

How to convert timestamps quickly

1
Paste a Unix timestamp or pick a date in the form fields.
2
View the converted ISO string, local date, and UTC date in real time.
3
Use Now, Start of today, or Start of year buttons for common reference points.

Keep going

Generate IDs

Pair timestamps with UUIDs when building traceable records or request IDs.

Decode JWT tokens

Read the iat, nbf, and exp claims and convert them back to dates with this tool.

Send a test request

Plug a fresh timestamp into an API request body and verify the endpoint behavior.

Format JSON with timestamps

Clean up payloads that include epoch fields before pasting them somewhere else.

Common timestamp workflows

Investigate a log entry

Convert the epoch in the log to local time to align with what a customer reported.

Verify token freshness

Confirm a recently issued JWT's exp claim corresponds to the lifetime your auth provider configured.

Write API tests with stable dates

Generate a known epoch value and use it across tests for deterministic results.

常见问题

两者都支持。绝对值小于 100,000,000,000 的整数会按秒处理；更大的数值会按毫秒处理。输出会同时显示秒和毫秒两种结果。

年/月/日/时/分/秒这些数字字段会按你的本地时区解释。ISO 字符串会按 JavaScript Date 的标准规则解析（存在 Z 或 offset 时会生效）。

Now 填入当前时刻。Start of today 设置为当天本地时间 00:00:00。Start of year 设置为当年 1 月 1 日本地时间 00:00:00。

因为实时钟每秒更新一次，方便你在测试 API 或查看日志时复制最新的 Unix 时间戳。