Date & Time Calculators
Calculate ages, count days, and manage schedules with 22 free date and time calculators. Calculator Archive's date calculators handle time intervals, calendar math, and scheduling. Whether you need to find the number of days between dates, calculate someone's exact age, or determine business days fo
All Date & Time Calculators (22)
Age Calculator
Calculate your exact age today or at any specific date. See your age in years, months, weeks, days, hours, minutes, and seconds instantly.
Date Adder
Add or subtract days, weeks, months, or years to any calendar date. Find target milestones, project deadline offsets, and event dates instantly.
Leap Year Calculator
Check if any year is a leap year. Read standard Gregorian criteria and list nearby leap years step-by-step.
Hours Calculator
Calculate total hours worked from clock-in/out logs with break subtractions and earnings estimation.
Date Difference Calculator
Calculate the exact years, months, weeks, days, and hours between two specific calendar dates.
Time Zone Converter
Convert hours and plan meetings between different global time zones with ease.
Age Difference Calculator
Calculate the precise age gap between two people in years, months, and days, and explore social dating compatibility.
Time Duration Calculator
Calculate the exact time difference between two clock times, including overnight wrap arounds and wage earnings.
Pet Age (Dog & Cat) Converter
Convert your dog's or cat's biological age into equivalent human years using scientific veterinary developmental models.
Days Until Calculator
Calculate the exact number of days, weeks, months, or hours remaining until any future date or event.
Add Days to Date Calculator
Add a specific number of days, weeks, months, or years to any starting date to find the future target date.
Subtract Days from Date Calculator
Subtract a specific number of days, weeks, months, or years from any date to find the historical calendar date.
Days in Month Calculator
Find the exact number of days in any month of any year, fully accounting for leap years and century rules.
Week Number Calculator
Determine the exact week number of any date, or find the start and end dates of a specific week number in any year.
Business Days Calculator
Calculate the exact number of business days (working days) between two dates, excluding weekends and public holidays.
Work Days Calculator
Calculate total work days, hours, and billable earnings based on custom weekly shifts, hourly rates, and time spans.
Next Friday Calculator
Find the exact date of the next Friday (or any other day of the week) and countdown the hours, minutes, and seconds.
Days Until Christmas Calculator
Find the exact number of days, hours, minutes, and seconds left until Christmas Day (December 25).
Days Until Birthday Calculator
Calculate the exact days, weeks, and hours left until your next birthday, and see how many days you have been alive.
Days Until Summer Calculator
Find the exact days remaining until the start of summer (summer solstice) in either the Northern or Southern hemisphere.
Historical Date Calculator
Explore historical timelines, calculate days since historical events, and determine what day of the week major events occurred.
Date of Birth Calculator
Calculate your exact age in years, months, days, hours, and minutes, and estimate your approximate conception window.