Dates
Add or subtract days from a date, count business days, and convert between 24-hour and 12-hour time.
Dates and clock formats
The date calculator adds or subtracts days, weeks, months and years, counts the days between two dates, and can count business days with US federal holidays skipped on their observed dates. The military time converter switches between 24-hour and 12-hour AM/PM time and has a full 24-hour chart.
Common questions
How many days are between two dates?
Subtract the earlier date from the later one. From January 1 to March 1, 2026 is 59 days; add 1 if you want to count both the first and last day.
What is 1700 in military time?
1700 is 5:00 PM. For any military hour from 13 to 23, subtract 12 and add PM.