Date & Time Calculators
Date and time calculators for age, date differences, countdowns, time zones, and scheduling. Precise temporal calculations for everyday needs.
21 calculators available
21 calculators found
Date Calculations
10
Date Calculations
10Date Calculator
Add or subtract days, months, and years from a date, or calculate the exact difference between two dates.
Date Difference Calculator
Calculate the number of days, months, and years between two dates.
Add or Subtract Date Calculator
Add or subtract days, weeks, months, and years from any date with automatic leap year handling.
Days From Today Calculator
Calculate what the date will be after any number of days from a chosen date.
Days Until Calculator
Count down the days until a specific date, event, or milestone.
Countdown Timer
Countdown to a specific date or event with days, hours, and weeks breakdown.
Date Calendar
Look up the day of the week, leap year status, and calendar info for any date.
Sunrise Sunset Calculator
Explore day-of-year position and seasonal day length information for any date.
Government Shutdown Timer
Track time elapsed since the latest US government shutdown.
ISO Week Number Calculator
Find the ISO 8601 week number for any date, or convert a week number back to its date range.
Age Calculators
5
Age Calculators
5How Old Am I Calculator
Calculate your exact age in years, months, days, and hours from your birthdate.
Age Checker
Check if a person meets a minimum age requirement based on their birthdate.
Age Difference Calculator
Calculate the age gap in years, months, and days between two people.
Generation Calculator
Discover what generation you were born into based on your birth year.
Birthday Milestone Calculator
Discover life milestones like your 10,000th day alive and billionth second from your birthday.
Time Tools
6
Time Tools
6Hours Minutes Seconds Calculator
Add or subtract time values in hours, minutes, and seconds format.
Time to Decimal Calculator
Convert hours, minutes, and seconds to decimal time format.
Military Time Converter
Convert between standard 12-hour and military 24-hour time formats.
Stopwatch Timer
Add or subtract stopwatch lap times in minutes and seconds.
Time Clock Calculator
Calculate total weekly hours and pay from time card entries.
Work Hours Calculator
Calculate weekly work hours with breaks and overtime for payroll.
Which calculator do you need?
- I need to find the time between two datesDate Calculator
- I want to know my exact ageHow Old Am I Calculator
- I need to count down to an eventCountdown Timer
- I need to find a future date by adding daysDays From Today Calculator
- I need to add time values togetherHours Minutes Seconds Calculator
- I need to calculate work hours and payTime Clock Calculator
- I need to check if someone meets an age requirementAge Checker
- I need to convert time to decimal formatTime to Decimal Calculator
- I need to find the ISO week number for a dateISO Week Number Calculator
- I want to find birthday milestones like my 10,000th day aliveBirthday Milestone Calculator
Precise Date & Time Calculations
Date and time calculations can be surprisingly tricky — leap years, varying month lengths, daylight saving transitions, and time zone rules all add complexity. Our date calculators handle these edge cases correctly, giving you accurate results whether you're counting business days or converting between time zones.
Date Calculation Edge Cases
Counting months between dates like January 31 and February 28 can produce different results depending on the method used, and leap-year rules mean that February 29 only exists every four years (with century exceptions). Our calculators document how they handle these ambiguities so you always know what the result represents. For business-day calculations, weekends and configurable holidays are excluded automatically.