The calendar machinery also has a time function, which can be activated by pressing the year, as shown in the figure below.
If you want the change to be permanent, enter KLWP and change the global variable "Dat_hor" to "off", saving at the end before leaving.
Note:
In the KLWP settings, change the first day of the week to "Sunday" (if this is not done, the calendar may not work correctly).
In Blender