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Time zone converter, current time in UTC and Unix timestamp converter
Convert between time zones, see the current time in UTC, and convert Unix timestamps, ISO dates and epoch values.
Time zone converter and Unix timestamp converter
Relative:
Time zone converter
Time in
· Difference: h
Timezone
Build from parts
World clock
Difference
Examples
Timestamp
1700000000
ISO 8601
2023-11-14T22:13:20.000Z
Time Guides & articles
Unix Time and the Problem of Representing “Now”
Unix timestamps provide a simple shared timeline, but precision, leap seconds, clock quality, and interpretation still require deliberate choices.
Read articleUnix Timestamp to Date: Seconds, Milliseconds, and Time Zones
Convert Unix timestamps accurately by identifying seconds versus milliseconds, separating instants from local display, and handling time zones without guesswork.
Read articleTimezones, Daylight Saving, and Calendar Surprises
Local time is a political calendar rule, not a fixed numeric offset. Reliable scheduling requires preserving timezone identity and handling gaps and overlaps.
Read articleDesigning Reliable Time-Based Systems
Expiration, scheduling, retries, and event ordering need explicit clock semantics, idempotency, and tolerance for delayed or duplicated work.
Read articleRelated tools
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Open UUID generator and GUID generator onlineTime zone converter and Unix timestamp converter
Convert between time zones, see the current time in UTC, and convert Unix timestamps, ISO dates and epoch values. DevToolGrid Online offers a free Time zone converter, current time in UTC and Unix timestamp converter.
What is a Unix timestamp?
A Unix timestamp is the number of seconds that have elapsed since 1 January 1970 at 00:00 UTC, known as the epoch. It is a compact, timezone-independent way to store a moment in time. Most systems use seconds, but JavaScript and many APIs use milliseconds, which is why a value can have 10 or 13 digits.
How to convert a Unix timestamp
- 1 Paste a timestamp (seconds or milliseconds) or a date string.
- 2 Read the ISO 8601, UTC, local and human-readable relative time.
- 3 Pick a timezone to see the moment in any region, or build a date from individual parts.
- 4 Use the difference and add/subtract tools for date math.
Common timestamp mistakes
- Seconds vs millisecondsA 10-digit value is usually seconds and a 13-digit value milliseconds. Mixing them shifts the date by decades.
- UTC vs local timeA timestamp is always UTC. Forgetting to convert to the local zone leads to off-by-hours bugs.
- The year 2038 problem32-bit signed timestamps overflow in 2038. Use 64-bit storage for far-future dates.
Unix timestamp vs ISO 8601
A Unix timestamp is a single number — compact and easy to compare or sort, but not human-readable. ISO 8601 (such as 2023-11-14T22:13:20Z) is a text format that humans can read and that keeps timezone information. This tool converts freely between both, plus RFC 2822 and relative time.
FAQ
Is this tool free?
Yes. The Unix timestamp converter is completely free with no limits.
Is my data sent to a server?
No. All conversions run locally in your browser using your own system clock and timezone.
Does it support seconds and milliseconds?
Yes. It auto-detects 10-digit seconds and 13-digit milliseconds and shows both.
Can it convert between timezones?
Yes. Choose any IANA timezone to see the same moment in that region, with a live clock option.