Sort Calendar Dates

Sort calendar dates chronologically in ascending or descending order. Supports ISO 8601, US (MM/DD/YYYY), European (DD/MM/YYYY), and written month names, complete with an automatic ambiguity warning for ambiguous dates.

Private • In-browser processing • Zero server uploads

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How to Use Sort Calendar Dates

1
Paste Dates
Paste your list of dates (one per line, or separated by commas).
2
Select Order & Format
Choose Ascending or Descending, and specify your preferred rule for ambiguous dates (US vs European).
3
Copy Sorted List
Copy the chronologically sorted dates immediately.

Key Features

Multi-Format Ingestion
Recognizes ISO 8601 (YYYY-MM-DD), slash and dot formats (03/15/2024, 15.03.2024), and written names ('Jan 15, 2023').
Smart Ambiguity Warning
Detects dates like `03/04/2023` where month and day could be reversed, alerting you with an explicit warning banner.
Bidirectional Sorting
Sort from oldest to newest (ascending) or newest to oldest (descending).
Output Formatting Options
Normalize all entries into clean ISO standard (YYYY-MM-DD) or preserve the original typed strings.

Common Use Cases

  • Chronologically organizing invoice, receipt, and financial transaction dates.
  • Sorting historical event timelines, genealogical records, and research chronologies.
  • Cleaning up messy date lists extracted from spreadsheets or emails.
  • Normalizing mixed international date formats into ISO 8601 standard.

Frequently Asked Questions

When a date has both day and month numbers 12 or less (e.g. `03/04/2023`), it is impossible to know with certainty whether it represents March 4th (US style) or April 3rd (European style). The tool flags these dates specifically so you can verify them.

Yes! Formats like 'March 15, 2024', '15 Oct 2023', and 'July 4 1776' are fully recognized and converted.

Yes! Selecting 'Normalized ISO (YYYY-MM-DD)' converts all mixed date formats into standard international format.

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