Best Free Timestamp Converters
Unix timestamps — the number of seconds since January 1, 1970 — are the universal language of time in software. But reading "1711584000" and knowing it means March 28, 2024 requires a converter. Here are the best tools for translating between machine time and human time.
tools.fun Timestamp Converter
The tools.fun timestamp converter handles both directions: paste a Unix timestamp (seconds or milliseconds) to see the human-readable date and time, or select a date and time to get the Unix timestamp. The tool shows the result in your local timezone and UTC simultaneously, which eliminates confusion when working with servers in different time zones.
It also handles ISO 8601 format, RFC 2822, and relative time descriptions. The live "current timestamp" display updates in real time, giving you an instant reference for debugging time-sensitive code.
epochconverter.com — The Reference Site
epochconverter.com has been the go-to timestamp resource for years. Beyond basic conversion, it provides a batch converter (process multiple timestamps at once), a timestamp generator for specific dates, and reference tables showing epoch values for common dates. The "seconds since" calculator shows elapsed time between two dates.
The site also documents timestamp quirks: the Year 2038 problem (when 32-bit timestamps overflow), leap seconds, and the difference between Unix time and TAI time. For understanding the theory behind timestamps, the explanations are thorough.
Date.now() returns milliseconds, while most Unix systems and APIs use seconds. If a timestamp is 13 digits, it is milliseconds; if 10 digits, it is seconds. Getting this wrong shifts your time by a factor of 1000 — your "March 2024" date becomes "Year 56,000." Always check the magnitude of the timestamp.Command-Line Date Conversion
On macOS: date -r 1711584000 converts a Unix timestamp to a readable date. date +%s gives the current timestamp. On Linux: date -d @1711584000 for conversion, date +%s for current time.
For ISO 8601 output: date -u +"%Y-%m-%dT%H:%M:%SZ". This format is the standard for APIs and log files because it is unambiguous, sortable, and timezone-aware.
Python one-liner for quick conversions: python3 -c "from datetime import datetime; print(datetime.fromtimestamp(1711584000))". This is often faster than opening a web-based tool when you are already in the terminal.
Time Zone Pitfalls
Unix timestamps are inherently UTC — they represent a specific moment in time regardless of timezone. The confusion arises when converting to local time. A timestamp might represent "March 28, 2024 00:00 UTC" but display as "March 27, 2024 19:00" in US Eastern time.
When storing timestamps in databases, always store UTC and convert to local time only at the display layer. When APIs return timestamps, check whether they are UTC or local — the documentation should specify, but often does not. The tools.fun converter showing both UTC and local time helps clarify this ambiguity.
{"time": 1711584000, "time_readable": "2024-03-28T00:00:00Z"}. Use the JSON Formatter to inspect API responses containing timestamps.Special Timestamps to Know
0: January 1, 1970 00:00:00 UTC — the Unix epoch. Seeing this in your data usually means a null or uninitialized date.
2147483647: January 19, 2038 03:14:07 UTC — the maximum 32-bit timestamp. Systems still using 32-bit timestamps will overflow on this date (the "Y2K38" problem).
-1: December 31, 1969 23:59:59 UTC — sometimes used as an error sentinel. If you see dates in 1969, a function likely returned -1 on failure.
253402300799: December 31, 9999 23:59:59 UTC — a common "maximum date" placeholder used to represent "no expiry" or "forever."
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