CSV to Timeline Converter
Choose title, start, and optional end columns. Ambiguous dates are never guessed; missing and reversed dates are listed for review.
CSV to Timeline Converter
Paste a header-based CSV. Dates are checked locally and ambiguous numeric dates are never guessed.
Timeline
Warnings
A QUICK WALKTHROUGH
How to use this tool
- Paste CSV with a header row.
- Choose the title, start date, and optional end date columns.
- Review flagged rows and download the valid timeline as JSON or CSV.
No ambiguous date guesses
ISO dates and unambiguous regional dates are accepted. Numeric dates such as 03/04/2026 are flagged because their order cannot be known from the value alone.
Review before export
Rows with missing starts, invalid dates, or an end before the start are reported and excluded from the clean timeline. A missing end date is a point event.
GOOD TO KNOW
Common questions
Are ambiguous dates converted?
No. Ambiguous dates are flagged rather than interpreted using a guessed locale.
What happens to a blank end date?
It is represented as a point event with no end date.
Is data uploaded?
No. CSV parsing and export happen in this browser.