Free tool
Convert Unix epoch timestamps (seconds and milliseconds) into human-readable ISO, UTC, and local date formats.
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Unix epoch time is the standardized system for tracking time, representing the total number of seconds elapsed since 00:00:00 UTC on January 1, 1970 (excluding leap seconds). It is the universal temporal standard across databases, cloud servers, and commerce APIs because it eliminates timezone ambiguities and daylight saving time confusion.
A frequent bug in web development occurs when handling timestamps across different programming languages. Unix timestamps in PHP, MySQL, and Python are typically represented in 10-digit seconds (e.g., 1757183600), whereas JavaScript Date.now() and Java represent timestamps in 13-digit milliseconds (e.g., 1757183600000). Identifying the unit prevents dates from calculating thousands of years in the future.
Engineers encounter Unix timestamps when inspecting order creation dates in Shopify webhooks, setting cookie expiration timestamps, verifying SSL certificate validity windows, and configuring flash sale countdown timers.
Count the digits. Current epoch timestamps in seconds have 10 digits (starting with 17...). Timestamps in milliseconds have 13 digits (ending with three extra zeroes or millisecond precision).
On January 19, 2038, standard 32-bit signed integers will overflow their maximum capacity (2,147,483,647 seconds), wrapping into negative numbers and crashing legacy systems. Modern 64-bit systems resolve this issue, extending valid timestamps billions of years into the future.
Unix epoch time is strictly timezone-independent; it is identical everywhere on Earth at any given moment. Timezone offsets are applied purely at the presentation layer when formatting the epoch number into local calendar hours and dates.
The W3C and Google sitemap protocols recommend ISO 8601 formatting: YYYY-MM-DDThh:mm:ssZ (for example, 2026-09-06T12:00:00Z) with an explicit UTC indicator (Z) or timezone offset.
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