Step 1
Identify the source unit
Confirm whether the value is Unix seconds, Unix milliseconds, or an ISO string before converting anything.
ToolsTimestamp Converter
converters
Convert timestamps and debug timezone mistakes fast
Check Unix seconds, milliseconds, ISO strings, UTC offsets, and local time side by side before shipping a broken date.
How to use it
3
Examples to try
3
Frequently asked questions
3
Related tools
5
timestamp converterunix timestamp toolseconds vs millisecondsutc local time converterdebug timestamps
How to use it
6Timestamp bugs are rarely about formatting alone. They usually come from unit mismatches, implicit local time, or assumptions about daylight saving behavior. This page is structured for those search intents while the converter remains interactive.
How to use it
6Timestamp bugs are rarely about formatting alone. They usually come from unit mismatches, implicit local time, or assumptions about daylight saving behavior. This page is structured for those search intents while the converter remains interactive.
Step 2
Compare UTC and local output
Always review both so it is obvious whether the bug is in storage, display, or timezone math.
Step 3
Validate the surrounding system
Check logs, database fields, and API docs to ensure every step in the chain uses the same convention.
What teams use it for
- Debug API payloads where backend and frontend disagree on units.
- Convert alert times between UTC and local support-team timezones.
- Verify JWT exp values or database audit fields during incident review.
Examples to try
6Check whether a 10-digit value is seconds or milliseconds.
Examples to try
6Check whether a 10-digit value is seconds or milliseconds.
Examples to try
- Check whether a 10-digit value is seconds or milliseconds.
- Compare one timestamp across UTC, browser local time, and ISO 8601.
- Validate an expiration time copied from a token payload.
Common pitfalls
- Assuming every Unix value is milliseconds because JavaScript Date uses them.
- Mixing display timezones with stored timestamps in logs.
- Ignoring DST boundaries when comparing local times.
Frequently asked questions
3Why are my dates off by exactly 1000x?
Frequently asked questions
3Why are my dates off by exactly 1000x?
Why are my dates off by exactly 1000x?
The most common cause is treating Unix seconds as milliseconds, or the reverse.
Should I store local time or UTC?
Store UTC whenever possible and convert for display at the edge. It keeps logs, APIs, and alerts consistent.
How do I debug daylight saving issues?
Show UTC and local representations together, then reproduce the timestamp around the transition boundary.
Open the tool
Related workflows
Related tools
Related tools
Related workflows
© 2026 www.tool1234.co. All rights reserved.