This tool was built out of frustration after running into problems when trying to convert
a date column to another (sortable) format (e.g. M/d/Y to yyyy-MM-dd) in Open/LibreOffice Calc.
(More description in link below functionality)
Usage:
Select your date column (from Libre/Open/MS Office) and copy/paste it to the left textarea.
Select appropriate input date format with the selector above the left textarea
Select desired output date format and current and target separator
Push the "Convert"-button
Given that you have enabled Javascript the result should appear in the right textarea
Copy/Paste your result back to your spreadsheet column. Select appropriate date format on column import.
All parsing and conversion is done in Javascript.
Enter your date column in the left textarea
Input Format
Output Format
Current Separator
Output Separator
Use leading zeros?
Year Prefix (only with "Leading zeros" enabled)