4D Doc Center : Day number

4D v13.4

Day number


Day number ( aDate ) -> Function result

Parameter	Type	Description
aDate	Date	Date for which to return the number
Function result	Longint	Number representing the weekday on which date falls

Description

The Day number command returns a number representing the weekday on which aDate falls.

Note: Day number returns 2 for null dates.

4D provides the following predefined constants, found in the "Days and Months" theme:

Constant	Type	Value
Sunday	Longint	1
Monday	Longint	2
Tuesday	Longint	3
Wednesday	Longint	4
Thursday	Longint	5
Friday	Longint	6
Saturday	Longint	7

Note: Day number of returns a value between 1 and 7. To get the day number within the month for a date, use the command Day of.

Example

The following example is a function that returns the current day as a string:

 $viDay :=Day number(Current date) ` $viDay gets the current day number

 Case of

    :($viDay =1)

       $0:="Sunday"

    :($viDay =2)

       $0:="Monday"

    :($viDay =3)

       $0:="Tuesday"

    :($viDay =4)

       $0:="Wednesday"

    :($viDay =5)

       $0:="Thursday"

    :($viDay =6)

       $0:="Friday"

    :($viDay =7)

       $0:="Saturday"

 End case