⏰Time & Date
Age, date difference, military time, and time zone tools.
Explore time and date calculators for scheduling, planning, payroll, travel, and everyday calendar questions. This category includes tools for age, date differences, business days, countdowns, time zones, hours worked, military time, day of the week, and other tasks where small calendar details can change the answer.
What You'll Find Here
You will find tools that solve both simple and surprisingly tricky time problems. Date and duration tools help you count days, weeks, months, birthdays, and age differences. Work and scheduling tools help with hours worked, time cards, business days, and deadline planning. Conversion tools help with military time, time zones, and time units. Calendar support tools help with month counts, seasons, day-of-year lookups, and other reference questions that come up in travel, HR, school, and personal planning.
All Time & Date Tools
Date Difference Calculator
Calculate the exact number of days, weeks, months, and years between two dates. Use this date difference calculator for planning, deadlines, and duration tracking.
Open toolAge Calculator
Calculate exact age from date of birth in years, months, and days. Also see total days lived and days until next birthday.
Open toolMilitary Time Converter
Convert between 12-hour and 24-hour military time instantly, and look up any hour on the full 0000 to 2300 military time chart with AM and PM equivalents.
Open toolDate Calculator
Find a date 90, 60, 45, or 30 days from today. Add or subtract days, weeks, months, or years from any start date.
Open toolTime Zone Converter
Convert date and time between UTC offsets quickly. Useful for remote meetings, travel planning, and international scheduling.
Open toolTime Calculator
Add or subtract hours and minutes from any start time to get the exact end time, with a note when the result crosses into another day.
Open toolHours Calculator
Use this hours calculator to find hours and minutes between two times, subtract breaks, and handle overnight shifts with clear examples.
Open toolBusiness Days Calculator
Use this business days calculator to count business days between dates with weekend handling and optional holiday exclusions.
Open toolHours Worked Calculator
Use this hours worked calculator to calculate shift duration, break deductions, decimal hours, and optional overtime hours.
Open toolCountdown Calculator
Count down to any date or holiday. One tap shows the days until Halloween, Christmas, Thanksgiving, Easter, and more, with a day, hour, minute, and second breakdown.
Open toolDay of Week Calculator
Use this day of week calculator to find the weekday for a selected date, including ISO weekday number.
Open toolTime Clock Calculator
Use this time clock calculator to add up clock-in and clock-out times across the week, deduct breaks, and get total hours, overtime, and gross pay.
Open toolWeeks in a Month Calculator
Find how many weeks are in a month. Pick any month and year to get the exact weeks as a decimal plus a whole-weeks-and-days breakdown.
Open toolHours in a Week Calculator
There are 168 hours in a week. Use this calculator to convert any number of weeks into hours, days, minutes, and seconds.
Open toolWeeks Left in the Year Calculator
Find how many weeks are left in the year from any date. Get the weeks remaining as a decimal, a weeks-and-days breakdown, and how much of the year is done.
Open toolWeeks in a Year Calculator
Find how many weeks are in a year. A normal year has 52.14 weeks and a leap year has 52.29 weeks. Enter any year for the exact weeks-and-days breakdown.
Open toolMonthly Calendar Generator
Make a printable calendar for any month and year. Pick the month, set the week to start on Sunday or Monday, and print or save a clean monthly grid.
Open toolSeasons Calculator
Find when each season starts in any year. See the first day of spring, summer, fall, and winter by the astronomical or meteorological calendar, for either hemisphere.
Open toolWorld Clock
See what time it is right now in any city. Live clocks for New York, London, Tokyo, Dubai, Arizona, Hawaii, and more, with the current UTC offset for each.
Open toolBirth Year Calculator
Find out what year you were born from your current age. If you are 25 in 2026 and your birthday has passed, you were born in 2001. Shows both possibilities.
Open toolMonth Counter
Count the months between two dates and get a years-and-months breakdown. Enter a start and end date to find exactly how many months apart they are.
Open toolDay of the Year
Find the day number for any date, plus days left in the year and the percent of the year completed, with leap-year support.
Open toolBirthday Calculator
Find the day of the week you were born, count the days until your next birthday, and see what age you are turning. Handles leap year birthdays too.
Open toolHours Until Calculator
Count the hours and minutes until any time. From 9:00 AM to 5:30 PM is 8 hours 30 minutes. Works for later today, tomorrow, or a specific date.
Open toolAge Difference Calculator
Calculate the exact age gap between two people from their birth dates. Someone born March 1995 and someone born August 1998 are 3 years 5 months apart.
Open toolExpiration Date Calculator
Calculate when something expires from its production date and shelf life. A product made March 15 with an 18-month shelf life expires September 15 the next year.
Open toolAudiobook Speed Calculator
See how long an audiobook takes at faster playback. A 12-hour book at 1.5x speed finishes in 8 hours, saving 4 hours. Works for podcasts and lectures too.
Open toolDrive Time Calculator
Use this drive time calculator to estimate trip duration from distance and average speed, add rest stops, and find your arrival time.
Open toolTime From Now Calculator
Find what time it will be in any number of hours and minutes from now. Get the exact time, date, and day of the week. Free, no signup.
Open toolAnniversary Calculator
Find how many years since a date and the days until the next anniversary. Enter a start date and get years completed, days since the last anniversary, and days until the next one.
Open toolDay Counter
Count the days since a past date or the days until a future date. Pick any calendar date and instantly see how many days have passed or how many days are left.
Open tool8 Hour Shift Calculator
Calculate when an 8-hour shift ends including breaks. Enter a start time and break length to get the end time. Or enter clock-in and clock-out to calculate hours worked.
Open toolMonths Between Dates Calculator
Calculate the number of months between two dates. Includes a years-and-months breakdown and total weeks. Enter a start and end date to get calendar months between them.
Open toolLeap Year Calculator
Check if a year is a leap year using the Gregorian rule, see how many days it has, and find the nearest leap years before and after it.
Open toolMinute Calculator
Add or subtract minutes from any start time to get the exact result. Adding 90 minutes to 11:30 PM lands at 1:00 AM the next day.
Open toolKorean Age Calculator
Convert a birth date to Korean age, international age, and counting age. Someone born December 31 turns 2 in Korean age the very next day.
Open toolGraduation Year Calculator
Enter a birthdate and see the expected high school and college graduation year, based on standard US kindergarten cutoff rules and a 12-year K-12 track.
Open toolFeatured Tools
Minute Calculator
Add or subtract minutes from any start time to get the exact result. Adding 90 minutes to 11:30 PM lands at 1:00 AM the next day.
FeaturedKorean Age Calculator
Convert a birth date to Korean age, international age, and counting age. Someone born December 31 turns 2 in Korean age the very next day.
FeaturedGraduation Year Calculator
Enter a birthdate and see the expected high school and college graduation year, based on standard US kindergarten cutoff rules and a 12-year K-12 track.
Grouped by Topic
Time math often feels inconsistent because people are really asking different questions. Counting calendar days is not the same as measuring exact elapsed hours. Business days exclude weekends and sometimes holidays. Age can depend on whether the birthday has passed in the current year. Travel time can shift because of time zones and daylight saving changes. The best way to use a time calculator is to decide what should count first, then choose the tool built for that rule so the result matches the real-world schedule you are working with.