Unix Timestamp Converter - Epoch Seconds & Milliseconds to Date
Unix time (POSIX or Epoch time) represents the number of seconds that have elapsed since midnight Coordinated Universal Time (UTC) on January 1, 1970 (not counting leap seconds). It is the ubiquitous standard for database timestamps, event logging, and caching expiration headers. This utility provides bidirectional conversion between raw integer timestamps and human-readable calendar dates across timezones.
When to Use This Tool
- Database Record Auditing: Translate raw integer timestamp columns (e.g. 1772619000) from SQL/NoSQL databases to readable dates.
- JWT Expiration Debugging: Convert "exp" and "iat" epoch claims from authorization tokens to local expiration times.
- Server Log Correlation: Sync and compare microservice log events recorded across disparate UTC/local time representations.
- Future Expiration Calculation: Generate exact timestamp values for Redis TTL keys or HTTP Cache-Control headers.
How to Use
- Current Time Display: View the live, ticking Unix epoch timestamp for right now.
- Timestamp to Date: Enter any 10-digit (seconds) or 13-digit (milliseconds) integer to see full UTC, ISO 8601, and local dates.
- Date to Timestamp: Pick any calendar date and time to calculate its corresponding Unix epoch integer.
- Copy Timestamp: Click copy next to any formatted representation for your code or database queries.
Input & Output Example
Input:
Timestamp: 1772619000
Output:
UTC: 2026-03-04 10:10:00
Local: 2026-03-04 19:10:00 (KST/JST, GMT+9)
ISO 8601: 2026-03-04T10:10:00.000Z
Frequently Asked Questions (FAQ)
Q. How can I tell seconds apart from milliseconds?
A. A standard 10-digit timestamp (e.g. 1772619000) represents seconds. A 13-digit timestamp (e.g. 1772619000000) represents milliseconds, which is the standard format used by JavaScript Date.now().
Q. What is the Year 2038 Problem (Y2038)?
A. On January 19, 2038, standard 32-bit signed integers will overflow 2,147,483,647 seconds and wrap around to negative numbers (1901). Modern 64-bit systems handle timestamps safely for hundreds of billions of years.
Q. Does Unix time account for leap seconds?
A. By definition (POSIX), Unix time ignores leap seconds. Each day is treated as strictly having 86,400 seconds.
Engineering & Privacy Notes
- Utilizes browser Intl.DateTimeFormat and Date objects for precise timezone calculations.
- Supports ISO 8601, RFC 2822, and standard locale-specific datetime formatting.
Related Developer Tools
- JWT Decoder: Inspect and convert epoch expiration claims inside tokens.
- UUID Generator: Generate unique identifiers alongside time-based transaction logs.
- Diff Checker: Compare timestamped server logs across incidents.
- Text Analyzer: Analyze log data volumes containing multiple timestamp records.