Date and Time Calculators

Calculators for dates and times: count the days between two dates, find an exact age, or add up hours and minutes. Each calculator explains how it counts, including how it handles the start and end date.

• Date & Time Military Time Converter Standard AM/PM time to military time and back, with a 24-hour chart.
• Date & Time How Many Days Until Christmas? Countdown to December 25 in days, weeks, hours and minutes, plus weekdays left.
• Date & Time Days Between Dates Number of days between two dates, plus weeks, months and weekdays.
• Date & Time Age Calculator Exact age from a date of birth in years, months and days, and days until the next birthday.
• Date & Time Time Calculator Time between two clock times, and adding or subtracting hours and minutes.
• Date & Time Decimal Hours Calculator Minutes to hours, hours:minutes to decimal hours and back, for time cards and payroll.

How to choose: to count days, use days between dates for any two dates, the age calculator for an exact age from a date of birth, and the Christmas countdown for the days left until December 25. For clock times, the time calculator finds the hours and minutes between two times, with an optional break, and adds or subtracts durations. The decimal hours calculator turns minutes, or hours and minutes, into decimal hours and back, the format time cards and payroll often use. The military time converter switches between AM/PM times and the 24-hour clock. If you track work hours for pay, the time card, overtime and hourly to salary calculators are in Small Business and Payroll.