Timestamp Converter
Online two-way Unix timestamp and datetime converter. Auto-detects seconds/milliseconds and supports local and UTC timezones.
How to Use & FAQ
Timestamp Converter
Online two-way Unix timestamp and datetime converter. Auto-detects seconds/milliseconds and supports local and UTC timezones.
How to Use
- Enter a timestamp or dateFor example 1700000000 (seconds) or 2024-01-01 12:00:00; milliseconds can be the 13-digit form.
- Choose the unitAuto-detect seconds/milliseconds or set it manually to match your data.
- Choose the timezoneSwitch between Local and UTC to see how the same timestamp is displayed differently.
- View the resultOutputs the second/millisecond timestamp, local time, UTC time and ISO 8601; copy whichever you need.
- Two-way conversion tipsYou can convert both ways — handy for reconciling log times with API responses.
Related tools
Related reading
FAQ
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) since 1970-01-01 00:00:00 UTC. It uniformly represents a point in time and is timezone-independent — the same instant yields the same value in any timezone.
How do I tell seconds from milliseconds?
A common rule is by digit count: 10 digits is usually seconds (exhausted around 2286), 13 digits milliseconds. This tool auto-detects them and also lets you specify the unit, avoiding a 1000x error from mixing them up.
Why does the converted time differ from the server?
The timestamp itself is timezone-independent; only the displayed date is affected by timezone. Make sure the chosen timezone matches expectation: local time and UTC can differ by hours, which is normal, not a miscalculation.
Can it convert dates before 1970 or far in the future?
Yes. Timestamps may be negative (before 1970-01-01) and can represent far-future dates; this tool parses them as integers and is not limited by that.
What is the ISO 8601 format?
An international date-time format such as 2024-01-01T12:00:00Z, where the trailing Z means UTC; with offset it is 2024-01-01T20:00:00+08:00. It is widely used in APIs and logs for unambiguous cross-timezone exchange.
Can timestamps overflow (the 2038 problem)?
A 32-bit signed integer storing second-level timestamps overflows on 2038-01-19 — the "2038 problem" of legacy systems. This tool and most modern languages/systems use 64-bit integers with a huge range, so there is nothing to worry about.
How do I get the current timestamp in the frontend?
In JavaScript, Date.now() gives milliseconds and Math.floor(Date.now()/1000) gives seconds; Node is the same. Agree on the unit with the backend to avoid a 1000x mismatch.
What database type should I store timestamps in?
For recording and computing, a BIGINT integer is safest — easy to sort and timezone-agnostic. For display with timezone, store TIMESTAMP / DATETIME or an ISO 8601 string. Do not store local-formatted strings, or it breaks across timezones.