Leap days are unicorns
Only 1 in 1,461 days is February 29. Expanding your range to include leap years is the only way this generator can ever surface that rare birthday.
Calendar math
Random Date Generator — Range, Multiple, Unique
Range & Options
Results
Tip: Ctrl/Cmd + K focuses the first date field. Ctrl/Cmd + Enter regenerates.
How it works
This random date generator is a simple way to pick unbiased dates for planning, testing, or creative work. Whether you are scheduling a surprise, building a dataset, or creating writing prompts, it gives you dates that are evenly distributed across a chosen range. You can include times down to the minute or keep it date‑only for birthdays, anniversaries, and calendar exercises.
The tool works by converting your start and end dates into timestamps, which are just numbers representing time. It then picks random points in that range. When you turn off “Include time,” it samples whole days instead of minutes, so each day has an equal chance of being selected. If you turn on “Unique,” the generator keeps track of what it already picked so you do not see duplicates. If your range is too small for the number of unique dates you requested, it will let you know.
Using the generator is straightforward:
- Choose a start date and an end date.
- Select how many dates you want to generate.
- Turn “Include time” on if you need full timestamps.
- Enable “Unique” if you want all results to be different.
- Click Generate to see your list of random dates.
This is helpful in real-world scenarios like QA testing for scheduling apps, creating randomized study plans, picking fair contest dates, or generating practice data for spreadsheets. Teachers can use it to build random history timelines or math problems. Writers often use random dates to spark story ideas or anchor fictional events in a believable calendar.
Because the generator samples uniformly, it avoids common human bias like over‑picking birthdays in summer or avoiding certain numbers. That makes it useful for simulations and experiments where you want a neutral distribution. And since everything runs locally in your browser, your inputs stay private.
- Timestamp range: Start/end dates are converted into UNIX timestamps (milliseconds since 1 Jan 1970).
- Uniform sampling: We draw a random timestamp uniformly in the inclusive range.
- Date-only mode: When “Include time” is off, we sample at day granularity.
- Unique mode: We avoid duplicates by tracking previously generated values.
- Privacy-first: Everything runs locally—no uploads, ever.
5 Fun Facts about Random Dates
Unix time vanishes in 2038
Old 32-bit systems can’t represent dates after 19 January 2038. Because this tool runs in modern browsers, you can safely hop far beyond that “Y2K for engineers.”
Nerd alert
Humans aren’t random
When people “make up” dates, they over-pick birthdays in summer and avoid the 13th. Uniform sampling here helps QA teams catch those subconscious biases.
Bias buster
History spikes on certain days
Run a wide range and you’ll inevitably hit 1 January 1970—the Unix epoch—and other loaded anniversaries. Pair the result with Wikipedia and you’ve got instant trivia prompts.
Trivia fuel
Time zones stretch ranges
Including time multiplies the domain by 86,400 per day. That’s why “Unique” can handle huge lists with times on, but struggles with date-only windows.
Range boost
FAQs
Are the generated dates unique?
Turn on Unique to enforce uniqueness. If you request more items than the range can provide (e.g., 500 unique days in a 100-day range), you’ll get a warning.
Does this tool send my data anywhere?
No. Generation happens entirely in your browser.
Can I include times?
Yes. “Include time” is on by default. Turn it off for date-only outputs (formatted by your chosen locale).
What’s the maximum list size?
Up to 100 items per run for responsiveness. Need more? Generate in batches.