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Add Days to a Date CalculatorAdd a number of days to a date to find what date it lands on.Add Months to a Date Calculator (Approximate)Estimate the date that results from adding a number of months to a start date, using the average month length.Add or Subtract Time CalculatorCalculate a new clock time by adding or subtracting a number of hours and minutes from a starting time.Age Calculator (By Birth Year)Estimate your age in years from your birth year and the current year.Age in Days, Hours, and Minutes CalculatorCalculate your exact age from your birth date, expressed in total days, hours, and minutes lived.Anniversary Countdown CalculatorCalculates how many days and years have passed since a meaningful date, such as a wedding or founding anniversary.Business Days Between Dates Calculator (Estimate)Estimate the number of business days (Monday to Friday) between two dates using a 5/7 weekday ratio.Countdown to Date CalculatorCalculates how many days and weeks remain until a future target date.Date Difference CalculatorCalculates the number of days, weeks and approximate years between two dates.Day of the Week Finder CalculatorFinds what day of the week any date falls on, past or future.Day of Year CalculatorFind which day number (1–365 or 366) a given date falls on within its year.Leap Year Checker CalculatorCheck whether a given year is a leap year using the standard Gregorian calendar rule.Minutes to Hours and Minutes CalculatorConverts a total number of minutes into a whole-hours-and-minutes format.Months Between Dates Calculator (Approximate)Estimate the number of months between two dates using the average month length (30.44 days).Precise Age CalculatorCalculates your exact age in both total days and completed years from a birth date.Project Deadline CalculatorCalculates a project's deadline date and duration in weeks from a start date and number of working days.Quarter Calculator (Which Quarter a Date Falls In)Find which calendar quarter (Q1–Q4) a given month falls in.Time Card Calculator (Work Hours)Calculate total hours worked from clock-in and clock-out times, minus any unpaid break.Time Elapsed Calculator (Multiple Units)Calculate the exact time elapsed between two dates, shown in days, hours, and minutes.Time Until Retirement CalculatorCalculates your projected retirement date and years remaining based on your birth date and target retirement age.Time Zone Difference Estimate CalculatorCalculates the hour difference between two time zones from their UTC offsets.Unix Timestamp / Epoch Day CalculatorConvert a calendar date into its Unix day number and timestamp in seconds, and see days from today.Weeks Between Dates CalculatorCalculate the number of whole weeks, plus any remaining days, between two dates.Work Days Between Dates Estimate CalculatorGives a quick statistical estimate of the number of weekdays between two dates using a 5/7 ratio.Work Hours to Workdays CalculatorConvert a total number of work hours into full workdays and remaining hours.
