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A Unix timestamp — the number of seconds since January 1, 1970 UTC — is how most systems and APIs store and pass around date/time values internally, but it's not something a person can read at a glance. This tool converts in both directions: enter a timestamp and get a readable date, or enter a date and get its timestamp — with a timezone of your choosing.
It automatically detects which direction to convert based on what you enter: a purely numeric value is treated as a timestamp, anything else is parsed as a date or time string.
How it works
Enter either a Unix timestamp (like 1735689600) or a date/time string (like "2025-01-01 00:00:00" or "January 1, 2025"), and optionally a timezone (UTC by default). The tool detects which one you entered and shows the result in both directions: the Unix timestamp, ISO 8601, RFC 2822, a human-readable date, and the day of the week.
- Enter a Unix timestamp or a date/time string.
- Optionally choose a timezone.
- Read the converted result in several formats.
Examples
Converting a timestamp from an API response
Pasting the timestamp 1735689600 shows it converts to January 1, 2025, 00:00:00 UTC — useful when debugging an API response that only gives you the raw number.
Getting a timestamp for a specific date
Entering "2025-06-15 09:00:00" with the America/New_York timezone gives the exact Unix timestamp representing 9am Eastern time on that date.
Who should use it
- Converting a raw timestamp from an API response or log file into a readable date.
- Getting the exact Unix timestamp for a specific date and time.
- Checking what a stored timestamp actually represents in a specific timezone.
Industry applications
- Software development and API debugging
- Log file analysis
- Data engineering
Advantages
- Converts in both directions automatically, no separate mode to pick.
- Shows the result in several standard formats (Unix, ISO 8601, RFC 2822, human-readable) at once.
- Supports any timezone, not just UTC.
Limitations
- Expects second-based Unix timestamps, not millisecond-based ones used by some JavaScript APIs.
- Doesn't support explicit relative date parsing (like "3 days ago").
Common mistakes to avoid
- Assuming a Unix timestamp is timezone-specific — it represents one universal instant, and only its displayed date/time depends on timezone.
- Confusing seconds-based Unix timestamps with millisecond timestamps used by some JavaScript APIs, which are 1000x larger.
- Forgetting to specify a timezone when the exact local time matters, defaulting to UTC without realizing it.
Best practices
- When debugging an API, check whether its timestamps are in seconds or milliseconds before converting.
- Specify the actual relevant timezone rather than assuming UTC, when the local date/time matters.
- Use ISO 8601 format when passing dates between systems, since it's unambiguous and widely supported.
Tips
- If a timestamp looks unusually large (13 digits instead of 10), it's likely in milliseconds — divide by 1000 before converting.
- When sharing a specific moment across timezones, share the Unix timestamp or ISO 8601 string rather than a local time, to avoid ambiguity.