Status: beta

Time zone and epoch converter

Leap-second aware conversion between UTC, GPS time, Julian dates, and Excel serial dates.

timekeeping
time
utilities

Timestamp (ISO, supports leap seconds)Target time zone

Unix & System Time

64-bit (Dec): 1772494930
64-bit (Hex): 0x0000000069A62051
32-bit Signed: 1772494929
32-bit Unsigned: 1772494929
JS Timestamp (ms): 1772494929885

Protocol Timestamps & Eras

Unix (Posix):
1772494929s
GPS (System):
1456530147s
NTP (Network):
3981483729s
Cocoa (Apple):
794187729s
Windows FileTime:
134169685298850000100ns

NTP Era: 0
Rollover: Feb 7, 2036
GPS Rollover: 2
1024-week period
TAI / PTP:
1772494966.885 (TAI)

World & Culture Calendars

Islamic (Hijri): Ramadan 13, 1447 AH
Hebrew: 13 Adar 5786
Persian: Esfand 11, 1404 AP
Indian National: Phalguna 11, 1947 Śaka
Ethiopic: Yekatit 23, 2018 AM
Bengali (Revised): 17 Falgun 1432 BE
Bengali (Traditional): 16 Falgun 1432 BE

Esoteric & Fiction

Mars Sol Date: 98889.38974
TNG Era: -296832.91
i
24th-century system. 1000 units per year. 2323.0 = 0.
TOS (Original): -238832.9
i
23rd-century system. Highly variable (~1000 units/year).
Kelvin Timeline: 2026.167
i
Format: YYYY.nnn where nnn is year progress (0-999).

Calendar History

ISO 8601: 2026-03-02(Proleptic Greg.)
Historical: 2 Mar 2026 (Gregorian N.S.)
Julian: 17 Feb 2026 AD(Proleptic)
Holocene: 12026 HE

Standard Formats

ISO Week: 2026-W10-1
Ordinal: 2026-061
Decimal Yr: 2026.167089
Swatch: @029

Julian Day Number (JD)

JD Number: 2461102.487614
Modified JD: 61101.987614
Truncated JD: 21101.987614

Excel Serial Dates

1900 system: 46083.987614
1904 system: 44621.987614

Days Since Epoch (Reference)

Unix: +20515.0

GPS: +16858.0

J2000.0: +9557.5

NTP: +46082.0

Lilian: +161942.0

ANSI: +155289.0

Cocoa: +9192.0