Timestamp Converter
Convert between Unix timestamps and human-readable dates
Frequently Asked Questions
What does a timestamp converter do?
A Unix timestamp is the number of seconds (or milliseconds) since 1970-01-01 UTC, and it shows up everywhere in logs, APIs, and created_at columns. This tool converts between timestamps and human-readable dates in both directions, with multi-timezone output so you instantly know which wall-clock time a log entry refers to.
Does it handle both seconds and milliseconds?
Yes. It auto-detects based on length: 10 digits is seconds, 13 digits is milliseconds. You can also switch manually. Microseconds (16 digits) and nanoseconds (19 digits) are supported too, covering most log formats.
Which time zones are supported?
It defaults to your browser's local zone and lets you switch to UTC or any IANA zone (Asia/Shanghai, America/New_York, etc.). The output panel shows ISO 8601, RFC 2822, and localized strings side by side so you do not have to consult documentation.
Is this tool affected by the Year 2038 problem?
The Y2038 issue comes from 32-bit signed integers overflowing on 2038-01-19. DevToolkit uses JavaScript Number (double-precision floats) with precision up to about 2^53 milliseconds, which covers millions of years. The tool itself has no such limit.
Is my data uploaded anywhere?
No. Conversion is fully client-side. Even business-sensitive log timestamps stay on your device.
When should I prefer Unix timestamps over ISO 8601?
Timestamps are compact and trivially sortable or subtractable, so they are great for internal storage. ISO 8601 (2026-04-17T08:00:00Z) is timezone-aware and human-readable, ideal for logs and API responses. Many systems keep both — timestamp for indexing, ISO for display.