Date & time calculators
Age, days between dates, work days, hours and time zones.
- Age CalculatorAge in years, months, and days from birth date to today or another date. Useful for exact age or time-between calculations.
- Date CalculatorAdd or subtract days from a date.
- Date Difference CalculatorNumber of calendar days between two dates. Enter start and end date; result is the day count (full 24-hour periods).
- Day of Week FinderWhat day of the week is a date? Enter any date to get the weekday (Monday–Sunday).
- Hours CalculatorHours between times or decimal hours.
- Time CalculatorAdd or subtract time (hours, minutes).
- Time Card CalculatorWork hours and overtime.
- Time Duration CalculatorDuration between two times.
- Time Zone ConverterConvert time between zones.
- Work Days CalculatorCount business days (Mon–Fri) between two dates. Does not exclude holidays; use for project timelines and contract periods.
Calculate age, days between dates, business days, and day-of-week. Useful for project timelines, contract periods, and "X days from today" or "how many weekdays" questions. All tools use calendar dates; business-day tools count Monday–Friday and do not exclude holidays unless noted.
Who they're for: Anyone planning deadlines, tracking age or duration, or checking how many working days fall between two dates. Results are in whole days or weekday names; time zones are not applied unless stated.
Common use cases: Finding how many days between two dates, counting work days between a start and end date (e.g. for shipping or contracts), finding what day of the week a date falls on, and calculating age in years, months, and days. For legal or contractual "business days," confirm whether holidays are excluded in your jurisdiction.