Common days
Color the overlap of two 2026 calendars.
OpenDays both calendars are actually open.
United States, England and Wales, India, and Germany for 2026, plus any date you add.
Compare reasons
See which side closed, and why.
OpenExport
CSV for a spreadsheet, ICS for a calendar.
OpenOn this device
The calculation stays in this browser. The worked example on the guide is written in HTML so the inputs and the result can be read without running the script.