HomeDate & timeDate & timeCompare dates, calculate durations, and convert time values in your browser.10 tools01Date differenceMeasure elapsed days, weeks, and calendar distance.02Add days to dateMove a calendar date forward by a chosen number of days.03Subtract days from dateMove a calendar date backward by a chosen number of days.04Business days calculatorCount weekdays between two calendar dates.05Day of year calculatorFind a date's ordinal day and remaining days in the year.06ISO week number calculatorFind the ISO week-year and week number for a date.07Time duration calculatorMeasure the duration between two clock times.08Duration unit converterConvert a duration across milliseconds through weeks.09Timezone converterView one instant in selected IANA timezones.10Age calculatorCalculate full years, months, and days from a birth date.