What week is it? How old are you exactly, in years, months and days? The date and time calculators make working with dates simple. The week number tool shows the current week number according to the ISO 8601 standard used in Europe and in international business, and converts any week number into its Monday-to-Sunday dates, which is handy for planning, schedules and deliveries.
The age calculator works out your exact age on any date, how many days you have been alive and how long it is until your next birthday. The explanation covers leap years and birthdays on February 29. You can also count the days between two dates, the working days in a period (with UK, US or Dutch public holidays), the days until any date such as Christmas, and convert times between time zones, with daylight saving time handled automatically.
All calculators in this category
- Week number – Today’s week number or the week of any date, plus 2026 week list.
- Age calculator – Your exact age in years, months, weeks and days.
- Working days – Business days between two dates, excluding weekends and public holidays.
- Days until – Count down to your vacation, birthday, Christmas or any other date.
- Days between dates – The number of days, weeks and weekdays between two dates.
- Time zone converter – Convert a time to another time zone, with daylight saving time.
Looking for something else? See all calculators on the home page.