These guides explain the assumptions behind the converters. Each example uses an explicit unit and zone so you can reproduce it in the working tools.
Unix time guides
Practical explanations for epoch units, ISO dates, time zones, daylight saving, the Year 2038 problem and current-time code.
01
What is a Unix timestamp?
Understand the epoch, UTC, negative values and what the number represents.
02Seconds vs milliseconds
Tell 10-digit seconds from 13-digit milliseconds and avoid thousand-fold errors.
03ISO 8601 and Unix time
Choose a readable interchange format without losing the exact instant.
04Time zones and DST
Handle offsets, daylight-saving gaps and repeated local times.
05The Year 2038 problem
Learn where signed 32-bit timestamps stop and what modern systems do.
06Get the current timestamp in code
Tested examples for common languages and databases.