Unix timestamps power the modern internet. Every database row, API response, log entry, and authentication token uses timestamps to record when events happen. But a number like 1745712000 tells you nothing — until you convert it to a human-readable date.
Our Timestamp Converter converts Unix timestamps to dates and dates to timestamps instantly, supporting multiple formats, timezones, and batch conversions — all in your browser.
What Is a Unix Timestamp?
A Unix timestamp is the number of seconds elapsed since January 1, 1970 at 00:00:00 UTC — the "Unix Epoch." This system was chosen because it's simple, universal, and timezone-independent. Every computer, regardless of location, agrees on the current Unix timestamp.
Current timestamp: 1745712000
Human-readable: May 27, 2026 00:00:00 UTC
Why 1970?
The Unix epoch wasn't arbitrary. Early Unix developers needed a consistent starting point for time measurement. January 1, 1970 was chosen when the first edition of the Unix Programmer's Manual was published, and it's been the standard ever since.
Common Timestamp Formats
Seconds (Standard Unix)
Most systems use seconds since epoch: 1745712000. This is the standard Unix timestamp used by Linux, macOS, PHP, Python, and most databases.
Milliseconds (JavaScript)
JavaScript's Date.now() returns milliseconds since epoch: 1745712000000. APIs and frontend code often use millisecond precision. Our converter handles both formats automatically.
ISO 8601 Strings
The ISO 8601 format is human-readable and timezone-aware: 2026-05-27T14:30:00Z. While not a numeric timestamp, it's the standard format for API communication (JSON, REST, GraphQL).
| Format | Example | Used By |
|---|---|---|
| Seconds | 1745712000 |
PHP, Python, MySQL, Linux |
| Milliseconds | 1745712000000 |
JavaScript, Java, C# |
| ISO 8601 | 2026-05-27T14:30:00Z |
JSON APIs, SQL, XML |
| RFC 2822 | Wed, 27 May 2026 14:30:00 GMT |
HTTP headers, email |
The Year 2038 Problem
Unix timestamps using a signed 32-bit integer will overflow on January 19, 2038 at 03:14:07 UTC. After that moment, the next second wraps to a negative number — interpreted as December 13, 1901. This is the "Year 2038 Problem" or "Unix Millennium Bug."
Most modern systems use 64-bit integers for timestamps, which won't overflow for nearly 300 billion years. However, legacy embedded systems, old databases, and some IoT devices still use 32-bit timestamps. If you're building long-lived systems, verify your timestamp storage uses 64 bits.
Timestamp Use Cases
API Development
REST APIs commonly use Unix timestamps in seconds or milliseconds for resource creation times, update timestamps, and expiration dates. Converting between timestamp formats during debugging is a daily task for API developers.
Database Queries
SQL databases store timestamps natively but often display them in ISO 8601 format. When querying ranges, filtering by Unix timestamp is faster than string-based date comparisons:
SELECT * FROM users WHERE created_at > 1745712000;
Log Analysis
Server logs use timestamps for chronological ordering. Converting Unix timestamps to human-readable dates helps identify patterns, correlate events across services, and pinpoint outages.
JWT Token Inspection
JSON Web Tokens use numeric dates (iat, exp) for issuance and expiration. Our JWT Decoder parses these claims, and our Timestamp Converter shows the exact human-readable time.
Working with Timezones
Unix timestamps are timezone-agnostic — they represent an absolute point in time regardless of location. The conversion to a human-readable date always depends on timezone:
- UTC — The universal standard, used by servers and databases
- Local time — Your system's configured timezone
- Specific timezone — Useful for coordinating across teams or regions
Our Timestamp Converter displays results in multiple timezones simultaneously, helping you coordinate across global teams.
Common Timestamp Mistakes
Using Seconds When Milliseconds Are Expected
A common bug: generating 1745712000 (seconds) but the API expects 1745712000000 (milliseconds). The result is interpreted as January 21, 1970 — an invalid date in most modern systems.
Ignoring Timezone During Conversion
Converting 1745712000 to "May 27, 2026" is correct only in UTC. In New York (EDT, UTC-4), it becomes May 26, 2026 at 8:00 PM. Always specify the timezone when communicating dates in human-readable form.
Storing Timestamps as Strings
String-date comparisons are slow and error-prone. Store timestamps as integers (preferably 64-bit) for efficient querying and sorting.
Assuming Locale-Specific Formatting
Different countries use different date formats (MM/DD/YYYY vs DD/MM/YYYY). When displaying dates to users, always use the user's locale or ISO 8601 format to avoid ambiguity.
Try It Now
Convert your first timestamp with the Timestamp Converter. Paste any Unix timestamp in seconds or milliseconds, and see the corresponding date in UTC, your local timezone, and multiple human-readable formats.
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