Time Epoch Rollover Checker

Show key time-storage overflow dates (Year 2038, 2-digit Y2K, 32-bit, 64-bit limits).

Time storage overflow milestones

Signed 32-bit Unix overflow (Y2038)

2147483647 s2038-01-19T03:14:07Z

time_t as int32 wraps to negative; affects legacy C, embedded, old filesystems.

Unsigned 32-bit Unix overflow

4294967295 s2106-02-07T06:28:15Z

Unsigned 32-bit second counters (some protocols) saturate here.

Year 2000 problem (Y2K)

2-digit year 99 → 002000-01-01T00:00:00Z

Two-digit year storage rolled 99 to 00; mostly remediated by 1999.

NTP era rollover (era 0 → 1)

2^32 seconds since 19002036-02-07T06:28:16Z

NTP 32-bit seconds field since 1900-01-01 wraps; NTPv4 uses era numbering.

GPS week number rollover (10-bit)

1024 weeks2038-11-21T00:00:00Z

Legacy 10-bit GPS week counter wraps every 1024 weeks; modern receivers use 13-bit.

Signed 64-bit Unix overflow

9223372036854775807 s~year 292,277,026,596

int64 time_t — effectively never; this is the modern standard.

Signed 64-bit milliseconds (JS Date max)

8640000000000000 ms+275760-09-13T00:00:00Z

JavaScript Date caps at ±8.64e15 ms (±100,000,000 days from epoch).

Windows FILETIME (64-bit, 100 ns since 1601)

2^64 × 100 ns~year 60056

100-nanosecond ticks since 1601-01-01 UTC; overflow is far future.

8 milestonesAll datetimes in UTC

Interpret an integer (optional)

Optional: paste an integer to interpret it as seconds and milliseconds.

Convert clock times between 12-hour AM/PM and 24-hour formats, single or in bulk.

Add or subtract a number of business days to a date, skipping weekends and custom holidays.

Add or subtract days, weeks, months, or years from a date and get the resulting date in multiple formats.

Calculate exact age from a birth date in years, months, days, plus total days, hours, and the next birthday countdown.

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