DayNumCalc vs Datum - Calendar Usage & Stats
DayNumCalc gives easy access to basic date calculations:
- The current date/day number information is immediately available. Examples: day 1 = 1 January; day 365 = 31 December (non-leap year) or 30 December (leap year)
- Date/day number calculations: get the day number from a chosen date, and a date from a paired year/day number
- Calculate the number of days between two dates
- Determine a date after adding or subtracting a number of days fro a chosen date
- Check the day of the week for a date of your choice
Widgets for the Home Screen, the Today View, and the Lock Screen are available for ease of use.
- Apple App Store
- Paid
- Utilities
Store Rank
- -
Datum is a minimalistic iOS, watchOS, macOS and visionOS calendar app.
For iOS there are Lockscreen Widgets that show you the current date and there are Lockscreen Widgets that show up to 3 events for today.
The iOS and macOS apps include the following widgets:
- a small widget that shows the current date and at the bottom the events for this day
- a small widget that shows a calendar with up to 3 event marks for each day
- a medium widget that shows the same as the first small widget and on the right side a calendar with up to 3 event marks for each day
- a large widget that shows the same as the medium widget and a list of the upcoming events
- a extra large widget that shows a calendar and a list of the upcoming events (only for iPadOS 15+)
The watchOS app shows a calendar with up to 3 event marks for each day. You can switch to the next/previous month by tapping on the arrows at the bottom of the calendar. You can view all events for each day by tapping on a day. There are also complications for all watchfaces included that show you the current date.
- Apple App Store
- Paid
- Utilities
Store Rank
- -
DayNumCalc VS. 
Datum - CalendarJanuary 18, 2026