Unix Timestamp Converter
One Number, No Timezone Ambiguity
A Unix timestamp counts the seconds elapsed since midnight UTC on January 1, 1970 — the "Unix epoch." Because it's a single integer with no timezone attached, it's the format of choice for logs, databases, and APIs that need to store or compare moments in time unambiguously, leaving the human-readable formatting and timezone conversion to whatever displays the value later.
The Formulas
Timestamp → Date: Date = UTC datetime represented by the timestamp (seconds since 1970-01-01 00:00:00 UTC)
Date → Timestamp: Timestamp = Seconds elapsed since 1970-01-01 00:00:00 UTC
Date → Timestamp: Timestamp = Seconds elapsed since 1970-01-01 00:00:00 UTC
Reference Points
| Timestamp | UTC date/time |
|---|---|
| 0 | 1970-01-01 00:00:00 UTC (the epoch) |
| 1000000000 | 2001-09-09 01:46:40 UTC |
| 1735689600 | 2025-01-01 00:00:00 UTC |
Because the timestamp is always UTC-based, converting it to a local date and time requires applying the viewer's timezone offset separately — this calculator returns the UTC value directly.
Where This Matters
- Debugging logs across timezones — when a server log stores a raw Unix timestamp, converting it to a readable date confirms exactly when an event occurred without ambiguity about whose local time it reflects.
- Database and API timestamps — many systems store creation and modification times as Unix timestamps for compact, timezone-agnostic storage, requiring conversion for display or reporting.
- Scheduling and expiration logic — session tokens, cache entries, and scheduled jobs frequently compare against a target Unix timestamp, so converting a human-chosen date into that format is a common setup step.
How to Use This Calculator
- Choose a mode: Timestamp to Date or Date to Timestamp.
- For Timestamp to Date: enter the Unix Timestamp in seconds.
- For Date to Timestamp: enter a Date and optionally a Time (HH:MM:SS, defaults to 00:00:00).
- Select Calculate to see the converted value.
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