What is Epoch Converter?
Epoch timestamps are everywhere in logs, APIs, and databases, but they are hard to read without conversion. Confusing seconds with milliseconds or mishandling timezones leads to subtle bugs.
Epoch/Unix Timestamp Converter makes it easy to translate between human-readable dates and epoch values so developers can debug time-related issues quickly.
Time formats are easy to misinterpret
APIs return timestamps in seconds or milliseconds, and mixing them up shifts dates by decades.
Logs are often in UTC while local debugging happens in local timezones.
Manual conversion is slow and error prone during incident response.
Daylight saving shifts can cause unexpected schedule behavior.
Fast conversion with clear context
This tool converts between epoch values and readable dates in both directions.
Local processing keeps data private and responsive.
It does not validate business logic around timezones or DST; use it as a conversion aid.
How to Use Epoch Converter
- 1Enter a timestamp - Paste a Unix value in seconds or milliseconds.
- 2Choose unit - Select seconds or milliseconds.
- 3View date - See the converted date instantly.
- 4Convert back - Pick a date to generate epoch values.
- 5Check timezone - Confirm the displayed timezone.
- 6Copy result - Use in logs, tests, or scripts.
Key Features
- Bidirectional conversion
- Seconds and milliseconds support
- Current timestamp display
- Multiple timezone support
- Date picker interface
- Copy with one click
Benefits
- Debug timestamp-related bugs
- Convert API response timestamps
- Calculate time differences
- Verify log file timestamps
- Generate timestamps for testing
Use cases
API debugging
Verify timestamp fields in responses.
Log analysis
Translate log times during incidents.
QA testing
Generate timestamps for test fixtures.
Database checks
Interpret stored epoch values.
Monitoring
Compare event times across systems.
Scheduling
Confirm cron-related timestamps.
Data pipelines
Normalize timestamps for ETL.
Analytics
Validate event time windows.
Tips and common mistakes
Tips
- Verify whether your source uses seconds or milliseconds.
- Use UTC for consistent comparisons.
- Check for off-by-one errors around DST.
- Normalize timestamps before aggregating logs.
- Store raw epoch values alongside formatted dates.
- Use ISO 8601 for human-readable outputs.
- Double-check locale settings in logs.
- Test boundary dates like end of month.
Common mistakes
- Mixing seconds and milliseconds silently.
- Assuming timestamps are local time.
- Ignoring DST and timezone offsets.
- Using formatted dates for sorting instead of epoch.
- Relying on client time for server comparisons.
- Copying timestamps with trailing whitespace.
- Assuming all APIs use UTC.
- Failing to document timestamp units in schemas.
Technical Details
Handles Unix timestamps (seconds since January 1, 1970 UTC).
All processing is performed client-side using JavaScript. No data is transmitted to external servers.
Educational notes
- Epoch values are seconds since 1970-01-01 UTC.
- Milliseconds are common in JavaScript timestamps.
- Timezone offsets affect display, not epoch values.
- DST can cause ambiguous local times.
- Use ISO 8601 for readable timestamps.
- Normalize time units across systems.
- Negative epochs represent pre-1970 dates.
- Leap seconds are generally ignored.
Frequently Asked Questions
Why are some timestamps 10 digits and others 13?
10 digits are seconds; 13 digits are milliseconds.
Is epoch time always UTC?
Yes. Epoch values represent seconds since 1970-01-01 UTC.
Is my timestamp uploaded?
No. Conversion happens locally in your browser.
How do I handle DST?
Use UTC for storage and convert to local time for display.
Can I convert negative timestamps?
Yes, they represent dates before 1970.
Why does my date look off by hours?
Timezone offset differences are the most common cause.
Does this support milliseconds?
Yes. Select the correct unit before converting.
Can I convert ISO dates to epoch?
Yes, paste or select a date to get epoch values.
Are leap seconds included?
Epoch time typically ignores leap seconds.
Should I store epoch or ISO?
Store epoch for computation; use ISO for display.
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