Unix Timestamp Converter

About Unix timestamp converter

Converts Unix timestamps to readable dates and dates back to timestamps, in any IANA timezone your browser knows. It accepts seconds or milliseconds through an Auto, Seconds and Milliseconds choice whose exact rule is printed under the input, and shows results as ISO 8601, RFC 2822 and a locale string. A live epoch clock at the top gives the current time in seconds and milliseconds.

How to use it

1. Choose an IANA timezone under Timezone, or leave the zone your browser reports.
2. On the Timestamp to date tab, type a value and leave Unit on Auto, or set it to Seconds or Milliseconds yourself. The line under the field says which unit is being used.
3. Read the results: ISO 8601 in the selected zone and in UTC, RFC 2822, a locale string, the day of the week and a relative time badge.
4. Switch to Date to timestamp, pick a Date and a Time, and read the epoch seconds, epoch milliseconds and UTC ISO value.
5. Press Use now as input for the current moment, or use the copy buttons beside any value.

1700000000 seconds shown in Dubai

Timestamp: 1700000000
Unit: Auto (read as seconds, 10 digits)
Timezone: Asia/Dubai

ISO 8601 (selected zone): 2023-11-15T02:13:20+04:00
ISO 8601 (UTC): 2023-11-14T22:13:20.000Z
RFC 2822: Wed, 15 Nov 2023 02:13:20 +0400

When to use it

• Decoding an exp or iat value taken from a token or a log line.
• Working out what a database created_at integer means in a customer's timezone.
• Converting a meeting time in a particular city into an epoch value for a scheduled job.
• Telling seconds from milliseconds when an API returns a suspiciously large number.

Questions about Unix timestamp converter

How does Auto decide, and when should I override it?

It counts the digits before any decimal point and ignores the sign. Twelve or more digits mean milliseconds, which starts at 1973-03-03, and fewer mean seconds. A millisecond value from before then, such as 86400000 for 1970-01-02, has too few digits, so pick Milliseconds yourself.

Are leap seconds counted?

No. Unix time counts seconds since 1970-01-01 UTC and treats every day as exactly 86,400 seconds, so leap seconds are absorbed. JavaScript dates behave the same way.

What range of dates works?

Anything a JavaScript Date can hold, which is about 270,000 years on either side of 1970. Negative timestamps give dates before 1970, and fractions are rounded to the nearest millisecond.

Why does one timestamp fall on different days in different zones?

The instant is the same but the wall clock differs. 1700000000 is 22:13 on November 14 in UTC, yet already November 15 in Dubai, so pick the zone that matches the person reading the date.

What input format does the date tab expect?

A date as year-month-day and a time as HH:MM or HH:MM:SS, interpreted in the selected timezone. The offset is resolved twice to settle daylight saving boundaries.

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