GPS time now: GPS week, seconds and UTC offset
GPS time is 18 seconds ahead of UTC and has been since January 1, 2017. It started at midnight on January 6, 1980 and never adds leap seconds. GPS counts time as a week number plus seconds into the week, starting each Sunday at 00:00 GPS time.
Live, from your device clock. For a check against atomic time, see the exact time page.
GPS time (as a date and time)
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Conversions use the full leap-second table since 1980 (GPS − UTC grew from 0 to 18 s). Dates after the next announced leap second, if one is ever added, would need updating.
GPS time vs. UTC vs. TAI
| Time scale | Leap seconds? | Offset now |
|---|---|---|
| UTC (civil time) | Yes | reference |
| GPS time | No (fixed when GPS started in 1980) | UTC + 18 s |
| TAI (International Atomic Time) | No | UTC + 37 s (GPS + 19 s) |
The International Earth Rotation and Reference Systems Service (IERS) confirmed in July 2026 that no leap second will be added at the end of December 2026, so these offsets hold until at least mid-2027. Leap seconds are due to stop entirely by 2035; see leap seconds.
The GPS week rollover
The original GPS signal stores the week number in 10 bits, so it counts 0 to 1023 and then starts again, about every 19.6 years. Rollovers happened on August 21–22, 1999 and April 6–7, 2019; the next is November 20–21, 2038. Old receivers that weren't updated can jump back 1024 weeks and show a date in the past. Newer GPS signals use a 13-bit week number.
Want the full story of how satellites turn time into your position? Read how GPS uses time. Related: Unix timestamp converter · Zulu time · UTC vs GMT
Questions people ask
What is GPS time now?
GPS time is UTC plus 18 seconds. The live clock above shows it, along with the GPS week number and seconds of the week.
Why is GPS time 18 seconds ahead of UTC?
GPS time started on January 6, 1980 matching UTC, but it never adds leap seconds. Since then UTC has added 18 leap seconds, the last on December 31, 2016, so GPS is now 18 seconds ahead.
What is the GPS week number?
The number of full weeks since January 6, 1980. Each GPS week starts at 00:00 on Sunday in GPS time. The legacy signal sends it modulo 1024.
When is the next GPS week rollover?
November 20–21, 2038, when the 10-bit week counter passes 1023 for the third time.
Last updated October 22, 2026.