Troubleshooting Unix Timestamp Conversion Issues
Unix timestamps can be confusing — seconds vs milliseconds, timezone handling, and the Year 2038 problem. Learn to diagnose and fix timestamp issues.
Key Takeaways
- A timestamp converts to a date thousands of years in the future, or to January 1970.
- Timestamps show the wrong time, offset by several hours.
- 32-bit Unix timestamps overflow on January 19, 2038 at 03:14:07 UTC.
- ### Cause Unix timestamps are always UTC.
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Seconds vs Milliseconds
Symptoms
A timestamp converts to a date thousands of years in the future, or to January 1970.
Cause
JavaScript uses milliseconds since epoch. Python and most APIs use seconds. Mixing them up produces dates in the year 50,000+ (millis interpreted as seconds) or January 1970 (seconds divided by 1000 twice).
Solution
Check the digit count: 10 digits = seconds (until 2286), 13 digits = milliseconds. Convert between them by multiplying or dividing by 1000.
Timezone Confusion
Symptoms
Timestamps show the wrong time, offset by several hours.
Cause
Unix timestamps are always UTC. Displaying them requires adding the local timezone offset. If the offset is applied incorrectly (or twice), times appear wrong.
Solution
Store and transmit timestamps in UTC. Convert to local time only for display. Use ISO 8601 format with timezone offset (e.g., 2025-03-15T14:30:00-05:00) to avoid ambiguity.
The Year 2038 Problem
Symptoms
32-bit Unix timestamps overflow on January 19, 2038 at 03:14:07 UTC.
Solution
Use 64-bit timestamps, which support dates until the year 292 billion. Most modern systems already use 64-bit timestamps by default.
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