Holiday Conflict Planner
Compare candidate event dates across published country and region holiday calendars. Include your own cultural dates and review coverage and tentative status.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
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How to use this calculator
Enter up to sixty candidate dates across at most three supported years. Choose up to five country/region calendars, select holiday types and add personal or cultural dates.
Every selected country/region/year must load before a comparison is shown. A blank region uses the national calendar or the country's required default. Published observances depend on coverage; extra cultural dates can be entered manually.
A worked example
For US and Canadian calendars, November 26, 2026 intersects US Thanksgiving, while December 25 intersects Christmas. A manually entered family gathering can also mark November 27.
Does a date without matches mean nobody observes a holiday?
No. It means no match in the selected published data and your additions. Local, community and unlisted observances can still apply; check the displayed coverage and future or tentative dates.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Most daily plans allow up to 366 dates; service-budget searches allow 731. Timed intervals have exclusive ends and use browser IANA time-zone rules; nonexistent local times are rejected and repeated times require your choice. Working calendars and policy terms are entered by you. The holiday comparison uses TimeCubby's published country/region coverage. Copy, CSV and print include assumptions; calendar exports appear when dated events exist.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.