01Live
Date Calculator
Calculate a date by adding or subtracting a chosen number of days, weeks or months.
Open calculator → Category 04
Date & Time
Calculate date differences, ages, durations, working days, deadlines, timestamps and other everyday time intervals. These tools can help with personal planning, project schedules and routine date checks. Confirm the relevant calendar, locale, holidays and time zone, especially when a deadline or cross-border schedule matters.
Date & Time Tools
All 50 Category 04 tools are now live, tested and connected.
02Live
Date Difference Calculator
Calculate the exact difference between two dates in days, weeks, months and years.
Open calculator →03Live
Days Between Dates Calculator
Find the number of calendar days between two selected dates.
Open calculator →04Live
Add Days to Date Calculator
Add days, weeks or months to a starting date and find the resulting date.
Open calculator →05Live
Subtract Days from Date Calculator
Subtract days, weeks or months from a starting date and find the resulting date.
Open calculator →06Live
Business Days Calculator
Calculate working days between dates while excluding weekends.
Open calculator →07Live
Working Days Calculator
Count working days across a selected date range.
Open calculator →08Live
Weekday Calculator
Find the day of the week for any date.
Open calculator →09Live
Day of the Year Calculator
Find the day number and remaining days within a year.
Open calculator →10Live
Week Number Calculator
Find the ISO week number for a selected date.
Open calculator →11Live
Days in Month Calculator
Find the number of days in any month and year.
Open calculator →12Live
Days in Year Calculator
Find whether a year has 365 or 366 days.
Open calculator →13Live
Leap Year Calculator
Check whether a year is a leap year.
Open calculator →14Live
Months Between Dates Calculator
Calculate the number of complete months between two dates.
Open calculator →15Live
Years Between Dates Calculator
Calculate the time between two dates in years.
Open calculator →16Live
Age Calculator
Calculate age in years, months and days from a birth date.
Open calculator →17Live
Age Difference Calculator
Calculate the age difference between two people or dates of birth.
Open calculator →18Live
Birthday Calculator
Find age and key birthday date information from a birth date.
Open calculator →19Live
Next Birthday Calculator
Calculate the time remaining until the next birthday.
Open calculator →20Live
Countdown Calculator
Count down to a selected future date and time.
Open calculator →21Live
Time Duration Calculator
Calculate elapsed time between two times.
Open calculator →22Live
Time Difference Calculator
Find the difference between two times or date-time values.
Open calculator →23Live
Add Time Calculator
Add hours, minutes and seconds to a starting time.
Open calculator →24Live
Subtract Time Calculator
Subtract hours, minutes and seconds from a starting time.
Open calculator →25Live
Hours Calculator
Convert and calculate time durations in hours and decimal hours.
Open calculator →26Live
Minutes Calculator
Convert and calculate time durations in minutes.
Open calculator →27Live
Seconds Calculator
Convert and calculate time durations in seconds.
Open calculator →28Live
Hours to Minutes Calculator
Convert hours into minutes.
Open calculator →29Live
Minutes to Seconds Calculator
Convert minutes into seconds.
Open calculator →30Live
Seconds to Hours Calculator
Convert seconds into hours.
Open calculator →31Live
Time Zone Converter
Convert a date and time between global time zones.
Open calculator →32Live
World Time Calculator
Compare local times across selected cities and time zones.
Open calculator →33Live
Unix Timestamp Converter
Convert Unix timestamps into readable dates and times.
Open calculator →34Live
Timestamp to Date Converter
Convert a timestamp into a human-readable date and time.
Open calculator →35Live
Date to Timestamp Converter
Convert a date and time into a Unix timestamp.
Open calculator →36Live
12 Hour to 24 Hour Converter
Convert 12-hour AM/PM time into 24-hour time.
Open calculator →37Live
24 Hour to 12 Hour Converter
Convert 24-hour time into 12-hour AM/PM format.
Open calculator →38Live
Military Time Converter
Convert standard time to military/24-hour time and back.
Open calculator →39Live
Julian Date Calculator
Calculate a Julian date from a calendar date.
Open calculator →40Live
Julian Day Calculator
Calculate the Julian Day Number for a selected date and time.
Open calculator →41Live
Easter Date Calculator
Find the date of Easter for a selected year.
Open calculator →42Live
Daylight Saving Time Calculator
Determine daylight-saving time changes for supported time zones.
Open calculator →43Live
Work Hours Calculator
Calculate total work hours from start, end and break time.
Open calculator →44Live
Time Card Calculator
Calculate daily and total hours from time-card entries.
Open calculator →45Live
Overtime Calculator
Calculate regular and overtime hours from a work schedule.
Open calculator →46Live
Sleep Time Calculator
Calculate sleep duration or recommended sleep timing from selected times.
Open calculator →47Live
Wake Up Time Calculator
Find wake-up times based on a selected bedtime and sleep duration.
Open calculator →48Live
Pomodoro Timer Calculator
Calculate Pomodoro work and break cycles for a study or work session.
Open calculator →49Live
Date Format Converter
Convert dates between common international date formats.
Open calculator →50Live
Date & Time Calculator
Perform common date and time calculations in one place.
Open calculator →Building Date & Time one tool at a time.
Each tool will be built with clear inputs, transparent formulas, useful explanations and a mobile-friendly interface.
RoadmapExplore the listed Date & Time tools for date calculations, durations and time-related tasks.
All 50 LiveEvery calculator in Category 04 is now connected. Choose any tool above to start calculating.