Date & Time Calculators · New Zealand

Calculate exact age in years, months and days from a date of birth.

Hours and minutes between a start and end time, with breaks and overnight shifts.

Weekly working hours from each day’s start, end and break times.

Exact duration between two date-times in days, hours, minutes and seconds.

ISO week number for any date, with day of year and days remaining.

Find the number of days, weeks, months and years between two dates.

Count the working days (excluding weekends) between two dates.

Add or subtract days from a date to find the resulting date.

Estimate your pregnancy due date from the last menstrual period (Naegele’s rule).