Date Test Data Generator
Generate future or past date/time test data with ISO 8601, date-only and Unix timestamp formats.
Generate repeatable date/time values in multiple test-friendly formats.
How to use Date Test Data Generator
Choose a base date/time, count, interval and direction. The generator creates CSV rows with UTC ISO timestamps, date-only values, Unix seconds, Unix milliseconds and a local display value. This is useful for boundary, expiry, scheduling and API test data.
Privacy
This tool runs locally in your browser. The values you paste or generate do not need to be sent to ToolHyv to perform the task.
Frequently asked questions
Are the generated times sent to ToolHyv?
No. Generation happens locally in your browser.
Are day and week steps calendar-aware?
The tool uses fixed elapsed-time intervals for predictable test data. Daylight-saving transitions can make local clock representations look different in some time zones.
Can I generate past dates?
Yes. Switch Direction to Past.