Random Date & Time Generator
Random dates or date-times between two dates — weekdays only, unique, sorted, at day, minute or second granularity, in ISO, US, EU or Unix format — from a seed.
A list of uniformly drawn calendar values in the format you chose, with the number of candidates in the range and the seed that reproduces the list, for fixtures and sample data.
Example: Five unique weekdays in January 2026 (22 candidates) sorted; three minute-level times between 09:00 and 17:00 over two days (962 candidates) as 2026-01-02T16:51:00Z; 2026-03-01 as Unix 1772323200.
Calendar values,
drawn uniformly.
How the candidates are defined, how draws are made, and why there is no time zone.
Candidates
Every day from the start to the end date is a candidate (weekdays only if asked); at minute or second granularity each day is multiplied by the slots in the time window. The candidate count is shown, and "unique" is refused when you ask for more values than exist.
Draws
A day is chosen uniformly, then a slot within it, from mulberry32 seeded with your number — so the same seed gives the same list on any machine, and a different seed a fresh one. Unique draws reject repeats; sorted orders the list ascending.
No time zone
Dates are calendar values, not instants: no offset is applied and no daylight-saving rule consulted. The Unix format reads the calendar value as UTC. Meant for fixtures, samples and test data. Nothing leaves the browser; the same four anonymous usage counts as the rest of the site apply.
SOURCES
- Uniform draw over whole days and seconds-of-day (no time zone — calendar values); mulberry32 PRNG for a seed; ISO 8601 date and date-time forms; Unix time as seconds since 1970-01-01T00:00:00Z
Last reviewed 21 September 2026. How results are checked: How we verify.