Date & Time Calculators
Dates and times come up constantly in planning, project management, legal work, and everyday life. Our five date and time calculators answer the most common questions people have about calendars and clocks. Find your exact age in years, months, and days — or calculate someone else's age at any point in history. Measure the precise gap between two dates for contract durations, project deadlines, or vacation planning. Count down to an upcoming event with the days-until tool. Figure out how many working days fall between two dates for payroll or shipping estimates. And use the time calculator to add or subtract hours and minutes from any starting time. All tools account for leap years, varying month lengths, and timezone rollovers.
Age Calculator
Calculate exact age in years, months, and days from date of birth.
Date Difference Calculator
Find the exact number of days, weeks, and months between two dates.
Days Until Calculator
Count down the days until a holiday, deadline, or special event.
Working Days Calculator
Count business days (Mon-Fri) between two dates excluding weekends.
Time Calculator
Add or subtract hours, minutes, and seconds from any time.
Frequently Asked Questions
How does the age calculator work?
Enter your date of birth and the calculator instantly shows your exact age in years, months, and days. It accounts for leap years and varying month lengths. You can also enter a future or past date to calculate age at any point in time — useful for eligibility checks, milestone planning, or historical research.
How do I calculate the number of days between two dates?
Enter a start date and end date into the date difference calculator. It returns the exact number of days, weeks, months, and years between them. This is useful for project timelines, contract durations, event planning, or calculating how many days until a deadline.
What is the working days calculator used for?
The working days calculator counts only business days (Monday through Friday) between two dates, excluding weekends. This is essential for project management, shipping estimates, legal deadlines, and payroll calculations where only working days matter. Some versions also let you exclude public holidays.
Can I add or subtract hours, minutes, and seconds?
Yes, the time calculator lets you add or subtract hours, minutes, and seconds to or from a starting time. It handles rollovers across midnight and can work with durations longer than 24 hours. This is useful for calculating shift lengths, cooking times, travel durations, and elapsed time between events.