Developer Tools
Unix Timestamp Converter
Convert Unix epoch timestamps (seconds & milliseconds) to human-readable dates and vice-versa.
Current Unix Epoch Time
1791480217
Convert Unix Timestamp → Human Date
ISO-8601 String
2026-10-08T17:23:37.000Z
GMT / UTC Date
Thu, 08 Oct 2026 17:23:37 GMT
Your Local Browser Time
10/8/2026, 5:23:37 PM
Relative Time
just now
Convert Calendar Date → Unix Timestamp
Timestamp (Seconds)1791288000
Timestamp (Milliseconds)1791288000000
Runs 100% locally in your browser. Zero data transmission.v1.0 • Client-side engine
How It Works & Underlying Concept
Unix time (also known as Epoch time) is the number of seconds that have elapsed since the Unix epoch, which is 00:00:00 UTC on 1 January 1970 (excluding leap seconds). It is the universal standard for logging events, scheduling background jobs, and transmitting dates across time zones.
Mathematical Formula / Rule
Epoch Seconds = Math.floor(Date.now() / 1000) | ISO-8601 = new Date(seconds * 1000).toISOString()Quick Instructions
1Paste any numeric Unix timestamp into the converter.
2Or pick a date and time from the date picker to generate a timestamp.
3Click 'Use Current Time' to immediately convert the present second.
Key Capabilities
- Bidirectional conversion: timestamp to human date, and date picker to timestamp
- Supports both 10-digit second timestamps and 13-digit millisecond timestamps
- Live 'Current Unix Epoch' clock with one-click copy
- Displays ISO-8601, UTC string, local time, and relative duration
Inspecting an Auth Token Expiration
A JWT payload contains an expiration field 'exp: 1735689600'.
Step 1:Enter 1735689600 into the converter.
Step 2:The tool converts it to UTC: 'Wed, 01 Jan 2025 00:00:00 GMT'.
Result: The token expires at midnight on New Year's Day 2025.
Technical Notes & Limits
- 32-bit signed integers will overflow on January 19, 2038 (the Year 2038 problem). This tool uses 64-bit JavaScript numbers to support dates far into the future.
Frequently Asked Questions
How do I know if my timestamp is in seconds or milliseconds?▾
Standard 10-digit timestamps (e.g. 1700000000) are in seconds. 13-digit timestamps (e.g. 1700000000000) are in milliseconds.
What was the Unix Epoch?▾
The Unix Epoch is January 1, 1970 at 00:00:00 UTC, chosen as the arbitrary baseline origin of computer time.
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