Text Timestamp Converter

Quick answer: Convert Unix timestamps (seconds or milliseconds) to readable dates and back. Open 文本时间戳转换 — everything runs locally in your browser, and files never leave your device.

Steps

1. Paste a timestamp, choosing seconds or milliseconds.
2. Read the local and UTC renderings.
3. Or pick a date to generate a timestamp.

Important notes

• Seconds vs milliseconds is a 1000x difference: 10 digits = seconds, 13 = milliseconds — the classic conversion bug.
• Display uses your local timezone; agree on UTC when collaborating across zones.
• Log forensics: convert the incident time to a timestamp, then grep.

Common questions

ISO 8601 support? Yes, both directions.

Why is my date a day off? You mixed seconds with milliseconds or ignored timezone.

Pro tips

Debug time conversions by pinning one known reference: Unix epoch 0 is 1970-01-01 00:00:00 UTC. If your pipeline shifts dates by hours, convert a timestamp whose UTC value you know and read both the UTC and local outputs — the offset you see is exactly the timezone bug. For databases, remember MySQL DATETIME has no timezone while ISO strings usually imply one; storing UTC everywhere and converting only at display time avoids the entire class of bugs.

What breaks at 2038? 32-bit second timestamps overflow in January 2038 — legacy systems storing time as int32 need migration; anything using 64-bit or milliseconds is fine.