Dayname; Dayofmonth - NUANCE OMNIFORM 2 REFERENCE FOR MACINTOSH Reference

DayName

The DayName function returns the name of the day of the week for a
given date.
Usage Example
DayName(Date())
If the current date is February 14, 1996
Then the calculation DayName(Date())returns Wednesday
In the example below, the name of the day of the week is calculated
using the Cur Date field and put in the Day Name field.

DayOfMonth

The DayOfMonth function returns the number for the day of the month
for a given date.
Usage Example
DayOfMonth(Date())
If the current date is February 14, 1996
Then the calculation DayOfMonth(Date()) returns 14
In the example below, the day of the month is extracted from the Date
field and placed in the Day field.
Functions
Using Calculations 9-13