Dates calculator
Date Calculator
Count calendar days between two dates, including leap years.
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Behind the answer
How to calculate
Days = end date − start date, using UTC calendar dates
Worked example
January 1 to January 2 is 1 day.
What to keep in mind
The start date is excluded. These are calendar days, not business days or elapsed local hours.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.