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Random Date Generator

Details

How to use Random Date Generator

What the tool does, how to run it, and what to expect from the result.

How to generate random dates in a range

Set the two ends of the range, pick an output format, and choose how many dates you want. Each date is drawn uniformly at random from the millisecond interval between the bounds and formatted in UTC.

The output is one date per line, ready to paste into a fixture, a spreadsheet, or a seed script.

  • Pick the start and end date; if you reverse them, they are swapped automatically.
  • Choose the format: ISO date, ISO date-time, US, EU, or Unix timestamp in seconds.
  • Set the count, up to a maximum of 1,000.
  • Press Generate to get one date per line, uniformly distributed across the range.
  • Copy the result, and de-duplicate if your target needs distinct values.
Tips

Getting a better result out of Random Date Generator

Specific settings and thresholds, not general advice.

  • Dates are picked uniformly across the millisecond range between your two bounds, so a 10-year window gives you an even spread rather than a cluster. There is no weighting toward business days, weekdays, or working hours.
  • If you enter an end date earlier than the start date, they are swapped rather than rejected, so the tool always produces something. Check the range you actually got if the output looks wrong.
  • The formats are ISO date (2026-07-13), full ISO date-time (with the Z suffix), US (MM/DD/YYYY), EU (DD/MM/YYYY), and Unix timestamp in seconds. Note that the timestamp is in seconds, not milliseconds, which is the format Unix tools and most APIs expect and the opposite of what JavaScript's Date.now() returns.
  • Everything is computed in UTC, so a date generated near midnight will not shift by a day depending on where you are. That is deliberate: test fixtures that drift with the tester's time zone are a classic source of flaky tests.
  • Duplicates are possible and become likely as the count grows relative to the range. Generating 100 dates inside a one-week window will produce repeats, since each is drawn independently.
Limits

What Random Date Generator does not do

The honest boundary, so you do not lose time finding it yourself.

  • Maximum 1,000 dates per generation.
  • No weekday-only, business-day, or exclude-weekend option.
  • No seed, so a batch cannot be reproduced.
  • No time-of-day control; the ISO date-time format takes a random time within the day.
At a glance

Who Random Date Generator is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Developers generating random dates for tests.

Ideal for

Using the random date generator without installing anything or signing up.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

What happens if my start date is after my end date?

The two bounds are sorted, so the earlier one is used as the start and the later one as the end. You get a valid set of dates from the range you implied rather than an error or an empty output, which means a typo in the year can quietly widen your range without warning.

Is the Unix timestamp in seconds or milliseconds?

Seconds, which is the POSIX convention used by most APIs, databases, and command-line tools. JavaScript's Date.now() returns milliseconds, so if you paste one of these into a JavaScript Date constructor without multiplying by 1000 you will land in January 1970.

Are the dates evenly distributed?

Yes, uniformly across the whole millisecond interval between the two bounds. There is no weighting, so weekends, holidays, and 3 a.m. are all as likely as any other moment. If your test needs business days only, filter the output afterwards.

Which time zone are the dates in?

UTC. The bounds are parsed as UTC midnight and every part of the output is formatted with the UTC accessors, so the same inputs give the same dates for a tester in Tokyo and one in Los Angeles. Only the ISO date-time format shows an explicit Z suffix, but all of them are UTC.

Can I get unique dates with no repeats?

No. Each date is drawn independently, so repeats are possible and are common when you ask for many dates inside a narrow window. De-duplicate afterwards, or widen the range so that collisions become unlikely.

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