Best Practices for Working with Unix Timestamps
Unix timestamps provide a language-agnostic way to represent points in time, but they come with pitfalls around time zones, precision, and the 2038 problem. This guide covers best practices for storing and converting timestamps.
Key Takeaways
- A Unix timestamp (also called epoch time) represents the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC.
- 32-bit signed integers overflow on January 19, 2038.
- Store timestamps in UTC, convert to local time for display only.
- ## Best Practices - Store timestamps in UTC, convert to local time for display only.
- Always use 64-bit integers for new systems.
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What Is a Unix Timestamp?
A Unix timestamp (also called epoch time) represents the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. It's a single integer that unambiguously identifies a moment in time, independent of time zones.
Precision Levels
| Precision | Unit | Max Value | Range |
|---|---|---|---|
| Seconds | 10 digits | 2,147,483,647 | Until 2038 (32-bit) |
| Milliseconds | 13 digits | ~8.6 quadrillion | Until year 275,760 |
| Microseconds | 16 digits | — | Until year 275,760 |
| Nanoseconds | 19 digits | — | Until year 2262 |
Common Pitfalls
The Year 2038 Problem
32-bit signed integers overflow on January 19, 2038. Systems using 32-bit timestamps will wrap to negative values, interpreting the date as December 1901. Always use 64-bit integers for new systems.
Time Zone Confusion
Unix timestamps are always UTC. When displaying timestamps to users, convert to their local time zone for display only. Never store local time as a Unix timestamp without noting the time zone.
Leap Seconds
Unix time does not account for leap seconds. Most systems handle this by smearing leap seconds over a longer period, but this means Unix timestamps are not perfectly aligned with UTC during leap second events.
Best Practices
- Store timestamps in UTC, convert to local time for display only.
- Use millisecond precision for web applications.
- Use ISO 8601 format for human-readable dates alongside timestamps.
- Always use 64-bit integers for timestamp storage.
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