Random Time Generator

What this tool does

Random Time Generator draws any number of random clock times from a time window you set, such as 09:00 to 17:00, including windows that cross midnight like 22:00 to 06:00. Results can be rounded to the nearest 5, 15 or 30 minutes so they line up with real-world appointment slots, shown in 12-hour or 24-hour notation, and either sorted earliest-first or left in the order they were drawn.

Scheduling tools, booking demos and test data for timesheets or calendars all tend to need a handful of plausible clock times rather than dates. Choosing them manually is fiddly, and a naive random generator that ignores minute rounding produces times like 14:37 that nobody actually books an appointment at.

This generator lets you set the exact window, including ones that wrap past midnight, round the output to common slot sizes, and switch the display between 24-hour and 12-hour AM/PM notation.

How to use Random Time Generator

1. Set the "From" and "To" time for your window using the time pickers.
2. If "To" is earlier than "From", the window is treated as crossing midnight, such as 22:00 through to 06:00.
3. Choose how many times to generate, from 1 up to 1000.
4. Pick a rounding step: off for exact minutes, or 5, 15, or 30 minutes to land on realistic slot boundaries.
5. Toggle 12-hour display on for AM/PM notation, or leave it off for 24-hour time.
6. Leave "Unique times" on to avoid repeats, and turn on "Sort results" to list times earliest-in-the-window first.
7. Press Generate, then copy the full list or read each row from the results table.

Tips for better results

• Use 15 or 30 minute rounding when generating sample appointment slots so the output matches how real booking systems work.
• An overnight window like 20:00 to 04:00 is fully supported; the generator treats it as crossing midnight rather than rejecting it.
• If a narrow window combined with coarse rounding does not contain enough unique slots for your requested count, widen the window, lower the count, or switch rounding off rather than allowing duplicates.
• Sorting respects the direction of the window, so an overnight range still sorts from the start time forward even though it technically spans two calendar days.

Common use cases

• Generating sample appointment or meeting slots for a scheduling app demo.
• Creating randomized clock-in and clock-out times for timesheet or attendance test data.
• Picking a random time for a daily reminder, alarm or notification within a preferred window.
• Producing random event start times for a calendar or event-planning mockup.

Common mistakes to avoid

• Assuming an overnight window like 23:00 to 05:00 is invalid; it is handled correctly as crossing midnight rather than being treated as a zero-length or backwards range.
• Setting the same start and end time; that window has zero length and the generator will flag it rather than silently returning one repeated value.
• Expecting rounded times to be evenly spaced from the exact start minute; rounding snaps candidates to the nearest step boundary within the window, not to fixed offsets from "From".
• Forgetting to check whether downstream code expects 24-hour or 12-hour format before exporting the list.