Unix Timestamp Converter
Convert Unix epoch timestamps to readable dates and dates back to timestamps
Current Unix Timestamp
4/26/2026, 1:10:52 AM
Timestamp to Date
Date to Timestamp
What is Unix Timestamp Converter?
Unix timestamps — also called epoch timestamps — are the standard way computers record moments in time. A Unix timestamp is the number of seconds (or milliseconds in many modern APIs) that have elapsed since 00:00:00 UTC on 1 January 1970, known as the Unix epoch. This format is used everywhere in software: database fields store created_at and updated_at as integers, API responses return expires_at values like 1735689600, server log files record access times as epoch values, JWT tokens encode iat (issued at) and exp (expiry) as Unix timestamps, and cloud services like AWS use epoch timestamps for event timestamps. The problem is that these numeric values are completely opaque to humans — 1735689600 means nothing without conversion. Our free Unix Timestamp Converter handles both directions: paste any Unix timestamp (in seconds or milliseconds) and instantly see the corresponding UTC date, local date, and ISO 8601 string. Or pick a date and time from a date picker and get the corresponding Unix timestamp to use in a query, API call, or test fixture.
How to Use Unix Timestamp Converter
- 1
Enter a Timestamp or Date
Paste a Unix timestamp (e.g., 1735689600 for seconds, or 1735689600000 for milliseconds) to convert to a date. Or pick a date and time to convert to a timestamp.
- 2
Instant Conversion
The tool automatically detects whether the input is in seconds or milliseconds, and converts to UTC date, your local timezone date, and ISO 8601 format simultaneously.
- 3
Copy the Result
Copy the converted date or timestamp to your clipboard for use in a query, API call, JWT inspection, log analysis, or database migration script.
Use Cases
Inspecting JWT Token Expiry
JWT tokens encode expiry (exp) and issued-at (iat) as Unix timestamps in seconds. When a user reports an authentication error, decode the JWT and paste the exp value here to see the exact human-readable expiry time — instantly confirming whether the token has expired, when it will expire, or whether the token was issued at an unexpected time.
Debugging API Response Timestamps
REST API responses from services like Stripe, GitHub, and AWS return timestamps in various formats: Unix seconds, Unix milliseconds, or ISO 8601 strings. When you receive an unexpected time value in a response, paste it here to confirm what date it represents — especially important when debugging scheduling logic, subscription expiries, or event ordering.
Writing Database Migration Scripts
When migrating data between systems, you often need to convert date strings from one format to Unix timestamps for a new schema, or the reverse. Generate the correct timestamp for a specific date here (e.g., start of 2025: 1735689600) to use as a filter condition in a migration SQL query or to populate a new timestamp column in a seed script.
Features
Seconds and Milliseconds Auto-Detection
Automatically detects whether your timestamp is in seconds (10 digits) or milliseconds (13 digits) — no need to manually convert.
UTC, Local, and ISO 8601 Output
Shows the converted time in UTC, your browser's local timezone, and ISO 8601 format (2025-01-01T00:00:00.000Z) — the three most common formats needed in development.
Current Timestamp Button
One click inserts the current Unix timestamp — useful for testing time-based code, generating test data, or quickly checking the current epoch value.
Date to Timestamp Conversion
Pick any date and time using the date-time picker and get the corresponding Unix timestamp in both seconds and milliseconds.
Frequently Asked Questions
A Unix timestamp is the number of seconds that have elapsed since the Unix epoch: 00:00:00 UTC on Thursday, 1 January 1970. It is an integer that increases by 1 every second, making it a universal, timezone-independent way to represent any moment in time. Unix timestamps are used throughout computing: databases, APIs, file systems, cryptographic tokens, and log files all record time as epoch values.
Seconds timestamps are 10 digits long as of 2024 (e.g., 1704067200). Milliseconds timestamps are 13 digits long (e.g., 1704067200000). JavaScript's Date.now() returns milliseconds; Python's time.time() returns seconds (as a float). Many modern APIs use milliseconds for higher precision. This tool auto-detects which format you have based on the number of digits.
The Year 2038 problem (Y2K38) affects systems that store Unix timestamps as 32-bit signed integers, which overflow at 03:14:07 UTC on 19 January 2038 (timestamp 2,147,483,647). After that point, a 32-bit signed integer rolls over to a large negative number representing 1901. Modern 64-bit systems store timestamps as 64-bit integers, which will not overflow for approximately 292 billion years. Legacy embedded systems and old C code using time_t as 32-bit are the main affected systems.
In JavaScript: new Date("2025-01-01T00:00:00Z").getTime() / 1000 (divide by 1000 to get seconds from milliseconds). In Python: import datetime; int(datetime.datetime(2025, 1, 1, tzinfo=datetime.timezone.utc).timestamp()). In SQL (PostgreSQL): EXTRACT(EPOCH FROM TIMESTAMP '2025-01-01 00:00:00 UTC'). Use UTC explicitly to avoid timezone-dependent results.
ISO 8601 is an international standard for representing dates and times as human-readable strings: 2025-01-01T00:00:00.000Z. The Z suffix means UTC. It is widely used in APIs, JSON responses, and database VARCHAR fields as an alternative to storing numeric timestamps. Converting between Unix timestamps and ISO 8601 strings is a common operation this tool handles in both directions.
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