Number base converter
Convert integers exactly between bases 2–36, including negative and very large values, with common base results shown together.
Date difference calculator
Count calendar days between dates, or add and subtract days from a date, with an option to skip weekends.
Days between dates
Days
Add or subtract days
Uses calendar days. Skipping weekends does not exclude public holidays.
About this tool
Count calendar days between dates, or add and subtract days from a date, with an option to skip weekends.
How to use
Use the left calculator for a date interval. Include the end date to count both endpoints; reverse intervals return a negative number. On the right, positive day counts move forward and negative counts move backward.
Calculations use calendar dates and are unaffected by 23- or 25-hour daylight-saving days. Skipping weekends excludes only Saturdays and Sundays, not public holidays. Valid dates from year 0001 to 9999 are supported.
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