JA Technology Solutions
Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back. Timezone support.
Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back. Essential for debugging API logs, database records, and event streams where times are stored as integers. Supports seconds and milliseconds, multiple timezones, and ISO 8601 output. Useful when comparing timestamps across systems that store time differently — databases, message queues, cloud logs, and third-party APIs.
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Unix Epoch Time Explained
Unix epoch time is the number of seconds that have elapsed since midnight UTC on January 1, 1970 — a date known as the “epoch.” It is the native time format of Unix, Linux, macOS, nearly every database, every major programming language, most log formats, all REST APIs worth the name, and the entire Internet. Representing time as a single number avoids every timezone headache, every leap-year edge case, and every locale-specific date format. The tradeoff is that epoch timestamps are unreadable to humans: 1712234400 means nothing until you convert it to “April 4, 2026 at 10:00 AM UTC.”
Seconds, Milliseconds, and the 2038 Problem
Most Unix tools use epoch seconds (a 10-digit number for current dates), but JavaScript, Java, and many modern APIs use epoch milliseconds (a 13-digit number). This tool auto-detects which unit you pasted based on magnitude and shows both representations. You will also hear about the Year 2038 problem: 32-bit signed integers can only represent epoch seconds through January 19, 2038 at 03:14:07 UTC, after which they overflow. Any system still using 32-bit time_t in 2038 will misinterpret dates the same way Y2K-vulnerable systems mishandled the year 2000. Modern 64-bit systems have a 292-billion-year runway, so the fix is mostly about auditing old embedded devices and ancient 32-bit code paths.
Timezones Done Right
The number one rule of dealing with time in software is: store everything in UTC, display in local time at the edge. This tool lets you convert an epoch to any IANA timezone (America/New_York, Europe/London, Asia/Tokyo) and handles DST transitions correctly. If you are building a system that crosses timezones — which today includes nearly every business application — getting the storage, display, and scheduling layers right matters. I build time-aware applications and reporting systems for multi-region operations where DST, fiscal calendars, and 24/7 operations all have to coexist. Learn about custom application development, explore integration services, or get in touch.
All tools run entirely in your browser. Your data never leaves your machine. Need help? Ask James.