About

Generating random dates is a frequent requirement for software testing, populating calendars, or simulation scenarios. This tool allows you to pick a random point in time between a start and end date. It goes beyond simple randomization by offering a 'Business Days Only' filter, which algorithmically excludes Saturdays and Sundays from the possible results.

You can also control the output format, choosing between standard ISO 8601, US (MM/DD/YYYY), or European (DD/MM/YYYY) formats, and optionally include time components.

Formulas

The core logic determines a random millisecond offset:

Time = Start + (Random() × (End - Start))

If the 'Business Days' filter is active, the algorithm checks:

Check Day. Calculate DayOfWeek (0=Sun, 6=Sat).
Validate. If Day is 0 or 6, discard and re-roll (or adjust to nearest Monday).
Format. Convert valid timestamp to string based on user selection.

Reference Data

Format Name	Pattern	Example
ISO 8601	YYYY-MM-DD HH:mm:ss	2025-12-31 23:59:59
US Standard	MM/DD/YYYY	12/31/2025
EU Standard	DD/MM/YYYY	31/12/2025
Unix Timestamp	Integer (Seconds)	1767225599

Frequently Asked Questions

Yes. The underlying JavaScript Date object correctly handles leap years (e.g., February 29th) when calculating ranges and validity.

Absolutely. Simply set your 'Start Date' to a past year (e.g., 1900) and your 'End Date' to today or another past date.

No. The filter currently only excludes weekends (Saturday and Sunday). Public holidays vary by country and are not automatically excluded.