Date & Time
Category
Date & Time Calculators
Figure out how many days separate two dates, compute age from a date of birth, or add and subtract days without spreadsheet gymnastics. These helpers respect leap years where the form documents it; holiday calendars are usually left for you to apply manually. Useful for contracts, school deadlines, travel planning, and personal milestones.
19 tools in this category — each page includes how-to steps, a worked example, formula notes, and FAQs.
- Anyone counting days between events or contract milestones
- Parents and students computing age for forms and cutoffs
- Planners adding or subtracting business days carefully
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Showing 19 of 19
- Date DifferenceFind the number of days between two dates.
- Add / Subtract DaysAdd or subtract a number of days from a starting date.
- Age from Date of BirthDetailed age breakdown from DOB — same engine as the math age tool.
- Business Days CalculatorCount weekdays (Mon–Fri) between two dates, excluding weekends.
- Unix Timestamp ConverterConvert between Unix epoch seconds and a human-readable date.
- Add Hours & MinutesAdd a duration of hours and minutes to a starting clock time (24h).
- ISO Week NumberFind the ISO-8601 week number for a given date.
- Business Days Between DatesCount weekdays (Mon–Fri) between two dates inclusive.
- Payday CalendarGenerate upcoming payday dates from a start date and frequency.
- Zodiac Sign CalculatorFind the Western sun-sign zodiac for a birth month and day (for fun).
- Days Until DateHow many days until (or since) a target date.
- Hours Between Date-TimesTotal hours between two date-time values (ISO-style).
- Age Difference CalculatorFind the difference between two birthdates (or dates) in days, years, and approximate months.
- Workdays CalculatorCount weekdays between two dates, optionally subtracting a simple holiday count.
- Datetime to Unix TimestampConvert an ISO or parseable date-time string into a Unix epoch timestamp (seconds).
- Timezone Meeting PlannerMap a base UTC hour across a list of UTC offsets to local times for scheduling multi-timezone meetings.
- Birthday CalculatorFind age, next birthday countdown, and the weekday you were born from a date of birth.
- Generation CalculatorMap a birth year to a commonly cited generation label (Gen Z, Millennial, Gen X, Boomer, …).
- Days From TodayJump forward or backward N days from today (or a chosen start date) — friendly date-offset tool.
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Looking for walkthroughs? See our guides on compound interest, EMI, mortgage, BMI, and percentage / tip / tax — or browse all calculators.