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What is Unix time (the epoch)?

Learn what a Unix timestamp is and why computers represent time this way.

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Seconds vs milliseconds vs microseconds

The same timestamp means different things depending on its digits. Here's how to tell them apart.

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The ISO 8601 date format

A look at the standard date notation most widely used in APIs and logs.

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Timezones, UTC and daylight saving

Understand why the same instant shows a different time in different regions.

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RFC 2822 · HTTP date format

Get to know the other date notation you meet in email and HTTP headers.

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The Year 2038 problem (Y2038)

Learn when 32-bit timestamps overflow and what it means.

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Get the current Unix timestamp (by language)

A collection of code snippets for getting the current Unix timestamp in several programming languages.

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Working with timestamps in databases

How to store and convert Unix timestamps in MySQL, PostgreSQL, SQLite and MongoDB.

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Common timestamp reference

A table of common Unix timestamp values and what they mean, handy for quick reference.

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