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Unix timestamp milestones

Round and special timestamps with their exact UTC dates.

TimestampUTC date and timeNote
-2,147,483,6481901-12-13T20:45:52ZSmallest signed 32-bit value
01970-01-01T00:00:00ZThe epoch
1,000,000,0002001-09-09T01:46:40ZOne billion seconds
1,500,000,0002017-07-14T02:40:00Z
1,700,000,0002023-11-14T22:13:20ZUsed in the examples on this site
2,000,000,0002033-05-18T03:33:20ZTwo billion seconds
2,147,483,6472038-01-19T03:14:07ZLargest signed 32-bit value
2,500,000,0002049-03-22T04:26:40Z
4,294,967,2952106-02-07T06:28:15ZLargest unsigned 32-bit value
9,999,999,9992286-11-20T17:46:39ZLast 10-digit timestamp

How the table was made

Each date was calculated with Python's datetime module by adding the number of seconds to 1 January 1970 00:00:00 UTC. The table is a quick way to get a feel for how large timestamps are: today's values are above 1.7 billion, and the signed 32-bit limit of 2,147,483,647 falls on 19 January 2038. The negative entry is the smallest value of a signed 32-bit integer, which lands in December 1901.

To convert any other number, use the epoch converter. To understand what happens at the 2038 limit, read the Year 2038 page.

This is an independent guide. It is not connected with the IERS, BIPM, IANA, NIST or any company named here. Facts were read on 14 November 2026 from the sources named on each page; calculated values come from Python.