Timestamp Comparator

Runs in browser

Compare two timestamps and calculate the difference in days, hours, and seconds.

Compare two timestamps and calculate the exact difference in days, hours, minutes, and seconds. Accepts Unix timestamps, ISO 8601 dates, milliseconds, and human-readable formats.

Timestamp Comparator tool

Timestamp A

ISO: 2026-05-27T08:07:28.000Z

Unix (s): 1779869248

Unix (ms): 1779869248000

Timestamp B

ISO: 2026-05-27T09:07:28.000Z

Unix (s): 1779872848

Unix (ms): 1779872848000

Comparison result

Timestamp A is earlier (older) · Timestamp B is later (newer)
00Days
01Hours
00Minutes
00Seconds
Total difference
1h 0m
Milliseconds
3,600,000
Seconds
3,600
A — date2026-05-27 08:07:28 UTC
B — date2026-05-27 09:07:28 UTC

🔒 Runs in your browser · No uploads · Your data never leaves your device

How to use

  1. Enter two timestamps

    Paste Unix timestamps (seconds or ms), ISO 8601 strings, or human-readable dates into each field.

  2. Read the diff

    The tool shows the absolute difference broken down into days, hours, minutes, and seconds.

  3. Supported formats

    Unix seconds (10 digits), Unix ms (13 digits), ISO 8601 (2024-01-15T12:00:00Z), and common date strings.

Common use cases

  • Checking API token expiry windows — Compare issued_at and expires_at timestamps from an API response to verify the remaining validity window.
  • Measuring operation durations — Find the exact difference between start and end timestamps in log files to measure how long an operation took.
  • Validating date ranges — Confirm that the gap between two dates meets requirements — for example, at least 7 days between scheduled events.

Examples

  • Unix diff

    Compare 1700000000 and 1700100000.

    Output
    1 day, 3 hours, 46 minutes, 40 seconds

Frequently asked questions

Does order matter?
No. The tool always returns the absolute difference regardless of which timestamp is larger.
What timezones are used?
Timestamps are compared in UTC to avoid DST ambiguity.

Key concepts

Unix timestamp
The number of seconds elapsed since January 1, 1970 (UTC), used widely in APIs and databases to represent instants in time.
ISO 8601
An international date-time format standard (e.g., 2024-01-15T12:00:00Z) that is unambiguous and timezone-aware.
UTC
Coordinated Universal Time — the primary global time standard with no daylight saving offset, used for consistent timestamp comparisons.

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