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Paste any Unix timestamp (epoch time) into the input field. Supports seconds (10 digits) or milliseconds (13 digits). Common use: converting timestamps from APIs, database records, log files, or server responses to human-readable dates.
See instant conversion to readable date-time format showing year, month, day, hours, minutes, seconds, and timezone. Displays both local time and UTC. Includes relative time ('2 hours ago') for recent timestamps.
Use the date picker to select a date and time, then convert to Unix timestamp. Essential for generating timestamps for API requests, database queries, or scheduling tasks with specific future/past dates.
Click copy to grab the timestamp or human-readable date for use in code, API payloads, database queries, or documentation. Supports both seconds and milliseconds formats for different language/platform requirements.
Understanding Unix timestamp conversion
Unix epoch time (or Unix timestamp) is a system for tracking time as the number of seconds elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). This timestamp format is the standard for representing dates and times in computing because it's timezone-agnostic, language-independent, unambiguous, and easily sortable as a simple integer.
Epoch timestamps appear everywhere in software development: API responses use epoch for created_at and updated_at fields, databases store timestamps as integers for efficient indexing and querying, log files include epoch timestamps for precise event ordering, authentication tokens encode expiration times as epoch values (JWT exp claims), cron jobs and schedulers use epoch for job execution times, and file systems track file modification times as epoch timestamps.
API data exchange: REST and GraphQL APIs commonly return timestamps as Unix epoch integers because they're unambiguous across timezones and languages. A timestamp like 1704067200 represents the same moment worldwide - no timezone confusion. Converting "2024-01-01 00:00:00" requires knowing the timezone, but epoch 1704067200 is absolute.
Database storage: Storing dates as epoch integers enables efficient indexing, range queries, and sorting. PostgreSQL's TIMESTAMP type internally uses similar representation. NoSQL databases like MongoDB store timestamps as Unix milliseconds. Epoch integers are 4-8 bytes vs. 20+ bytes for ISO date strings, saving storage and improving query performance.
Time-based calculations: Calculating time differences is trivial with epoch: end_epoch - start_epoch = duration in seconds. No date math complexity with months, leap years, daylight saving. Duration calculations across timezones are error-prone with human-readable dates but simple with epoch timestamps.
JWT tokens: JSON Web Tokens encode expiration (exp), issued-at (iat), and not-before (nbf) claims as Unix timestamps. Example: {exp: 1704067200, iat: 1704063600}. Token validation checks if current epoch < exp. Server and client must use epoch to avoid timezone/clock discrepancies.
Scheduling and cron: Task schedulers (cron, Kubernetes CronJobs, AWS EventBridge) use epoch timestamps internally. Scheduling a job for "January 1, 2024, 00:00 UTC" means converting to epoch 1704067200 for storage. Rate limiting algorithms (token bucket, sliding window) use epoch for timestamp comparisons.
Logging and monitoring: Application logs timestamp events with epoch milliseconds for precise ordering and correlation. Distributed systems use epoch to order events across services. Log aggregation (Elasticsearch, Splunk) indexes by epoch timestamp. Example log: {"timestamp": 1704067200000, "level": "ERROR", "message": "..."}.
Epoch seconds (10 digits): Standard Unix timestamp format. Example: 1704067200 = January 1, 2024, 00:00:00 UTC. Used by: Unix/Linux systems, many programming languages (C, PHP, Python's time.time()), most databases (PostgreSQL EXTRACT(EPOCH), MySQL UNIX_TIMESTAMP()).
Epoch milliseconds (13 digits): Millisecond precision. Example: 1704067200000 = same moment with ms precision. Used by: JavaScript (Date.now(), new Date().getTime()), Java (System.currentTimeMillis()), databases that support milliseconds (MongoDB, Cassandra), high-precision logging.
The tool auto-detects format: 10 digits = seconds, 13 digits = milliseconds. Converting between: seconds × 1000 = milliseconds, milliseconds ÷ 1000 = seconds.
Epoch timestamps are always UTC (Coordinated Universal Time). The epoch reference point "January 1, 1970, 00:00:00" is specifically UTC. When converting epoch to human-readable dates, you must specify target timezone. Same epoch value → different local times in different zones.
Example: Epoch 1704067200
Always store epoch (UTC) in databases. Convert to local timezone only for display, never for storage or calculations.
Why January 1, 1970? Unix operating system was developed in early 1970s. Developers chose a recent date as epoch to simplify calculations. The date has no special significance beyond being the start of the Unix era.
Year 2038 problem: 32-bit signed integers max at 2,147,483,647 (0x7FFFFFFF). As seconds since 1970, this represents January 19, 2038, 03:14:07 UTC. Systems using 32-bit epoch timestamps will overflow after this date (like Y2K bug). Solution: 64-bit timestamps support dates billions of years into future. Modern systems (64-bit OS, databases) use 64-bit integers, but legacy embedded systems may face 2038 issues.
Negative timestamps: Dates before January 1, 1970 have negative epoch values. Example: -86400 = December 31, 1969. Not all systems/languages support negative epoch properly. Most databases and languages support dates back to year 1 (PostgreSQL) or 1000 (JavaScript), but some embedded systems only handle positive epoch.
ISO 8601 vs. Epoch: ISO 8601 (2024-01-01T00:00:00Z) is human-readable but verbose and timezone-ambiguous without suffix. Epoch is compact and unambiguous. For APIs: epoch is often better for machine-to-machine, ISO 8601 better for human-readable APIs or debugging.
Relative time: "2 hours ago", "in 3 days" are computed from current epoch vs. stored epoch. current_time - stored_time = seconds_ago. Libraries like moment.js, date-fns provide relative time formatting from epoch differences.
Time precision: Epoch seconds lack sub-second precision. For high-precision timestamps (financial transactions, distributed systems ordering), use epoch milliseconds or even microseconds (16 digits).
This tool converts between Unix epoch timestamps and human-readable dates, auto-detecting seconds vs. milliseconds format, and displaying both UTC and local timezone equivalents.
How developers use epoch conversion
REST APIs commonly return timestamps as Unix epoch integers. Convert these timestamps to readable dates to debug API behavior, validate response data, or understand event ordering. Essential for API testing and troubleshooting.
JSON Web Tokens encode expiration times as Unix timestamps in the exp claim. Convert JWT exp values to readable dates to verify token lifetime, debug authentication issues, or validate token generation logic.
Convert human-readable dates to epoch timestamps for database queries with date range filters. More efficient than string date comparisons. Works with PostgreSQL, MySQL, MongoDB timestamp fields.
Application logs often include Unix timestamps (milliseconds) for precise event ordering. Convert log timestamps to readable dates for debugging, correlating events across services, or analyzing incident timelines.
Master Unix timestamp conversion
This tool converts between Unix epoch timestamps (seconds or milliseconds since January 1, 1970 UTC) and human-readable dates. Supports bidirectional conversion with automatic format detection.
Paste any Unix timestamp into the input field. The tool automatically detects format:
Examples:
Results display multiple formats:
Use the date/time picker to select a date and time. The tool converts your selection to Unix epoch timestamp in both formats:
The picker uses your local timezone but displays equivalent UTC. Example: Selecting "2024-01-01 00:00:00" in EST (UTC-5) generates epoch for "2024-01-01 05:00:00 UTC".
Critical: Epoch timestamps are always UTC. When you see "1704067200 = 2024-01-01 00:00:00", that's UTC time. In EST, the same epoch is "2023-12-31 19:00:00" (5 hours earlier clock time).
Best practice: Store epoch (UTC) in databases and APIs. Convert to local timezone only for display in user interfaces. Never store local time strings - use epoch for unambiguous, timezone-agnostic timestamps.
When to use seconds:
When to use milliseconds:
Convert between: seconds × 1000 = milliseconds, milliseconds ÷ 1000 = seconds.
Current time: Use Date.now() in JavaScript (milliseconds) or Math.floor(Date.now() / 1000) for seconds.
Future timestamps: Epoch values greater than current time represent future dates. Useful for scheduling, token expiration, cache TTL.
Past timestamps: Epoch values less than current time represent past dates. Useful for created_at, updated_at, event timestamps.
Negative epochs: Values < 0 represent dates before January 1, 1970. Example: -86400 = December 31, 1969.
Invalid ranges: Very large epochs (> 32-bit max) may cause issues in 32-bit systems. Verify your system supports 64-bit timestamps for dates beyond 2038.
Epoch seconds: Precision to 1 second. Sufficient for most applications (logs, API timestamps, database records).
Epoch milliseconds: Precision to 1 millisecond (0.001s). Required for high-frequency trading, distributed system event ordering, performance monitoring.
Sub-millisecond: Some systems use microseconds (16 digits) or nanoseconds (19 digits) for extreme precision. This tool focuses on seconds and milliseconds as they cover 99% of use cases.
Everything you need to know
Your data never leaves your browser
All epoch timestamp conversions happen entirely in your browser using client-side JavaScript Date APIs. Zero server communication, zero data transmission, zero logging.
Safe for converting sensitive timestamps from authentication tokens, financial transaction logs, proprietary API responses, regulated audit logs, or confidential system events. Use with confidence for production debugging and security token analysis.
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