4 free tools
Date & Calendar calculators
Date differences, calendars and time conversions. Each tool shows the formula, worked examples and sources.
Date & CalendarAdd Days to Date CalculatorAdd or subtract days, weeks, months or working days from any date.Date & CalendarAge CalculatorExact age in years, months and days, total days lived and the countdown to your next birthday.Date & CalendarDate Difference CalculatorDays, weeks, months and working days between two dates.Date & CalendarHijri Date ConverterConvert Gregorian dates to the Islamic (Hijri) calendar and back, using the Umm al-Qura calendar.