Developer Date & Epoch Calculator
Add or subtract time from a date, and convert the result to Unix timestamps, ISO 8601, SQL, and RFC 2822 formats.
Developer Outputs
About this tool
This Developer Date & Epoch Calculator is customized for engineers and developers who need to perform date shifts and immediately translate the target values into database, API, and network protocol time representations. It handles addition and subtraction at granular resolutions (seconds, hours, days, up to years).
How to use this tool
- Select the initial Base Date.
- Choose either the Add or Subtract operation.
- Enter the offset quantity and select the target unit (Seconds, Minutes, Hours, Days, Weeks, Months, or Years).
- Instantly copy the desired Unix epoch timestamp (seconds or milliseconds), ISO 8601 string, SQL DATETIME format, or RFC 2822 header time string.
Frequently asked questions
How is Unix epoch time calculated?
Unix epoch time is the number of seconds (or milliseconds) that have elapsed since January 1, 1970 (UTC), excluding leap seconds. This tool calculates epoch timestamps relative to UTC time.
Does this tool account for leap years?
Yes, all date arithmetic handles leap years, month length differences, and daylight saving snaps using standard native JavaScript Date computations.
Are my dates uploaded to any server?
No, all calculations and formatting happen client-side inside your browser for maximum speed and privacy.
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