Date & Time Converter
— or convert a date to a timestamp —
"Now" button:
How to Use
- Choose a mode: "Unix Timestamp", "ISO 8601 Format", or "Time Zone".
- Unix Timestamp: enter a timestamp to convert it to a readable date, or pick a date/time to get its Unix timestamp (in both seconds and milliseconds).
- ISO 8601: pick a date and time to see it formatted as a standard ISO 8601 string, in both UTC and your local time zone.
- Time Zone: enter a date/time and source time zone, then select a target time zone to see the converted time.
- Results update instantly as you type — no need to click Calculate.
Frequently Asked Questions
QWhat is a Unix timestamp?
A Unix timestamp (or Epoch time) is the number of seconds (or milliseconds) that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds. It is widely used in programming and databases to represent a point in time.
QWhat is the difference between seconds and milliseconds timestamps?
A seconds-based timestamp (10 digits for current dates) counts whole seconds since the Unix epoch. A milliseconds-based timestamp (13 digits for current dates) is 1,000 times larger and is commonly used by JavaScript's Date object and many APIs.
QWhat is ISO 8601 format?
ISO 8601 is an international standard for representing dates and times, e.g. "2026-06-11T14:30:00Z". The "Z" indicates UTC; offsets like "+05:30" indicate other time zones. It is unambiguous and widely used in APIs and data interchange.
QHow accurate is the time zone conversion?
Time zone conversions use your browser's built-in time zone database (IANA time zones), which includes daylight saving time rules. Results should match official local time for the selected zone and date.
QIs my data sent to a server?
No. All conversions happen locally in your browser using JavaScript's built-in Date and Intl APIs. Nothing is sent to or stored on any server.
About This Calculator
Conversions use JavaScript's native Date object and the Intl.DateTimeFormat API for time zone handling, which relies on the IANA time zone database built into your browser. This ensures correct handling of daylight saving time and historical time zone changes.
