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): 1774477603
64-bit (Hex): 0x0000000069C46123
32-bit Signed: 1774477603
32-bit Unsigned: 1774477603
JS Timestamp (ms): 1774477603460

Protocol Timestamps & Eras

Unix (Posix):
1774477603s
GPS (System):
1458512821s
NTP (Network):
3983466403s
Cocoa (Apple):
796170403s
Windows FileTime:
134189512034600000100ns

NTP Era: 0
Rollover: Feb 7, 2036
GPS Rollover: 2
1024-week period
TAI / PTP:
1774477640.460 (TAI)

World & Culture Calendars

Islamic (Hijri): Shawwal 6, 1447 AH
Hebrew: 7 Nisan 5786
Persian: Farvardin 5, 1405 AP
Indian National: Chaitra 4, 1948 Śaka
Ethiopic: Megabit 16, 2018 AM
Bengali (Revised): 10 Chaitra 1432 BE
Bengali (Traditional): 9 Chaitra 1432 BE

Esoteric & Fiction

Mars Sol Date: 98911.72337
TNG Era: -296770.04
i
24th-century system. 1000 units per year. 2323.0 = 0.
TOS (Original): -238769.8
i
23rd-century system. Highly variable (~1000 units/year).
Kelvin Timeline: 2026.230
i
Format: YYYY.nnn where nnn is year progress (0-999).

Calendar History

ISO 8601: 2026-03-25(Proleptic Greg.)
Historical: 25 Mar 2026 (Gregorian N.S.)
Julian: 12 Mar 2026 AD(Proleptic)
Holocene: 12026 HE

Standard Formats

ISO Week: 2026-W13-3
Ordinal: 2026-084
Decimal Yr: 2026.229960
Swatch: @976

Julian Day Number (JD)

JD Number: 2461125.435225
Modified JD: 61124.935225
Truncated JD: 21124.935225

Excel Serial Dates

1900 system: 46106.935225
1904 system: 44644.935225

Days Since Epoch (Reference)

Unix: +20537.9

GPS: +16880.9

J2000.0: +9580.4

NTP: +46104.9

Lilian: +161964.9

ANSI: +155311.9

Cocoa: +9214.9