Atomic Time Calculator
Convert between different atomic and astronomical time scales including UTC, TAI, GPS Time, and Terrestrial Time.
Live Atomic Clocks
UTC18:38:39
TAI18:39:16
GPS18:38:57
TT18:39:48
TAI - UTC = 37s (includes 27 leap seconds)
Time Scale Offsets
TAI - UTC37 seconds
GPS - UTC18 seconds
TT - UTC69.184 seconds
GPS Time Info
GPS Week
2403
Second of Week
432,000
Other Time Formats
Julian Date2461071.00
Modified Julian Date61070.50
Unix Timestamp1769731200
Leap Seconds27
Time Scale Definitions
- TAI: International Atomic Time, continuous count of SI seconds
- UTC: Coordinated Universal Time, TAI with leap seconds for Earth rotation
- GPS: GPS system time, no leap seconds since Jan 1980
- TT: Terrestrial Time, for astronomical calculations