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common timestamps

Common Unix Timestamps. Reference Table of Famous Epoch Values

Some epoch values are worth knowing by heart, they anchor your mental model of Unix time and let you sanity-check logs instantly. This table lists the famous ones, searchable.

reference table

Common Unix timestamps, memorized.

Start-of-year values, famous epochs, and the overflow moments you'll meet in logs and specs. Filter by name, year, or value (every row is a fixed instant.

current epoch seconds

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current epoch ms

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current UTC

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epoch (s) utc what it is
-86,400 Dec 31, 1969 00:00:00 One day before the epoch
0 Jan 1, 1970 00:00:00 Unix epoch — the zero point
315,964,800 Jan 6, 1980 00:00:00 GPS epoch
951,782,400 Feb 20, 2000 00:00:00 Mac HFS+ epoch (1904)
946,684,800 Jan 1, 2000 00:00:00 Y2K
978,307,200 Jan 1, 2001 00:00:00 Cocoa Core Data epoch (2001)
1,000,000,000 Sep 9, 2001 01:46:40 One billion seconds
1,104,537,600 Jan 1, 2005 00:00:00 Start of 2005
1,136,073,600 Jan 1, 2006 00:00:00 Start of 2006
1,142,974,214 Mar 21, 2006 20:50:14 First tweet on Twitter
1,167,609,600 Jan 1, 2007 00:00:00 Start of 2007
1,183,075,200 Jun 29, 2007 00:00:00 First iPhone ships (US)
1,199,145,600 Jan 1, 2008 00:00:00 Start of 2008
1,215,648,000 Jul 10, 2008 00:00:00 App Store launch
1,231,006,505 Jan 3, 2009 18:15:05 Bitcoin genesis block
1,262,304,000 Jan 1, 2010 00:00:00 Start of 2010
1,293,840,000 Jan 1, 2011 00:00:00 Start of 2011
1,325,376,000 Jan 1, 2012 00:00:00 Start of 2012
1,356,998,400 Jan 1, 2013 00:00:00 Start of 2013
1,388,534,400 Jan 1, 2014 00:00:00 Start of 2014
1,420,070,400 Jan 1, 2015 00:00:00 Start of 2015 · Discord snowflake epoch
1,451,606,400 Jan 1, 2016 00:00:00 Start of 2016
1,483,228,800 Jan 1, 2017 00:00:00 Start of 2017
1,514,764,800 Jan 1, 2018 00:00:00 Start of 2018
1,546,300,800 Jan 1, 2019 00:00:00 Start of 2019
1,577,836,800 Jan 1, 2020 00:00:00 Start of 2020
1,609,459,200 Jan 1, 2021 00:00:00 Start of 2021
1,640,995,200 Jan 1, 2022 00:00:00 Start of 2022
1,672,531,200 Jan 1, 2023 00:00:00 Start of 2023
1,704,067,200 Jan 1, 2024 00:00:00 Start of 2024
1,735,689,600 Jan 1, 2025 00:00:00 Start of 2025
1,767,225,600 Jan 1, 2026 00:00:00 Start of 2026
1,798,761,600 Jan 1, 2027 00:00:00 Start of 2027
1,893,456,000 Jan 1, 2030 00:00:00 Start of 2030
2,000,000,000 May 18, 2033 03:33:20 Two billion seconds
2,147,483,647 Jan 19, 2038 03:14:07 32-bit max — the Year 2038 problem
2,208,988,800 Jan 1, 1900 00:00:00 NTP epoch (seconds since 1900)
2,524,608,000 Jan 1, 2050 00:00:00 Start of 2050
4,102,444,800 Jan 1, 2100 00:00:00 Start of 2100
253,402,300,799 Dec 31, 9999 23:59:59 Far future — end of the 4-digit year

How to use the table

Each row is a fixed instant: the epoch seconds, its UTC date, and what makes it famous. Filter by name ("Y2K"), by year ("2024"), or by a value you are trying to place ("1.7 billion" matches 2026). The header trio shows the live epoch counter, so you always have a reference point for "now".

Anchor values worth memorizing

  • 0. Jan 1, 1970 00:00:00 UTC, the epoch itself.
  • 946,684,800. Jan 1, 2000. Y2K, a clean "round" 9-digit value.
  • 1,000,000,000. Sep 9, 2001, one billion seconds.
  • 1,577,836,800. Jan 1, 2020, the most useful recent start-of-year to remember.
  • 2,000,000,000. May 18, 2033, two billion seconds.
  • 2,147,483,647. Jan 19, 2038 03:14:07 UTC, the 32-bit wall.

Reading dates from a rough value

You do not need the table to place most timestamps: every 31,557,600 seconds is about a year (365.25 days), so an epoch of 1.7e9 is roughly 54 years after 1970, the mid-2020s. The start-of-year rows let you calibrate precisely: once you know 2026 starts at 1,767,225,600, any log value is easy to situate within a year.

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Sources & references

From memorized anchors to real conversions

The anchors on this page are most useful next to the tools that do the arithmetic for you:

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