Timestamp Converter
Input
Convert Unix epoch seconds or milliseconds and ISO-style dates. All calculations run locally in your browser.
Current Unix time
Epoch (Unix) time is the number of seconds (not milliseconds) since 1970-01-01 00:00:00 GMT (UTC). Values update in your browser.
Enter milliseconds/seconds
Whole numbers are seconds since 1970-01-01 UTC, except large integers with |n| ≥ 1e11 (100 billion), which are read as milliseconds. Decimals count as seconds. Convert shows UTC (ISO), local time, and Unix seconds/milliseconds. All in your browser.
Enter ISO-style
Use ISO 8601-style text (for example 2024-06-01T12:00:00Z for UTC, or 2024-06-01 for date-only — meaning depends on the browser). Other strings may parse in some environments but are not guaranteed. Output is whole Unix seconds (fractional seconds truncated).
All processing happens in your browser — your files are never uploaded to a server.
About this Tool
The Timestamp Converter on AllThatConverter translates Unix epoch numbers (seconds and milliseconds) to human-readable ISO 8601 datetime strings and vice versa. Powered by fast client-side calculations.
100% Secure Local Processing Active
This tool runs entirely on your device via WebAssembly and browser Canvas. No files are ever sent to any remote server, ensuring complete data security.
How to Use
Type or paste your epoch timestamp number (e.g., 1716960000) or standard calendar string into the input viewport.
Toggle milliseconds or seconds precision, and select your target timezone offsets (UTC or Local).
Copy any computed date formats or standard epoch numbers from our real-time results catalog.
Core Scenarios & Use Cases
Analyzing API & Database Timestamp Logs
Decodes cryptic numeric database records into easy-to-read datetime formats to debug database transactions quickly.
Timezone Offset Conversion
Compares UTC transaction offsets with your active regional timezone to fix server scheduling bugs.
Generating Test Seeding Timestamps
Acquires custom epoch values representing specific historical dates or future boundaries to seed development database states.
Frequently Asked Questions
Our real-time analyzer scans the digit counts: standard 10-digit entries are converted as seconds, while 13-digit parameters translate as milliseconds.
The tool query calls the native javascript date API in your current browser, ensuring the local time outputs perfectly match your OS system settings.