DBT - Days Between
This operator takes the days between Operand 2 and Operand 3, and stores the result in Operand 1.    This is calculated by subtracting the value in Operand 3 from the value in Operand 2.    The value stored in Operand 1 will be either a positive or negative value. 
	The number of months will be expressed as a fractional number.
Statement:			Find the number of days that have passed since the beginning of the year, store it into Variable Day of Year.
Line	CMD	OT	Operand 1	OPER	OT	Operand2	OT	Operand3	If Goto	Else GoTo
00010	LET	V	BEGINNING OF YEAR	BY	$S	PERIOD-END-DATE			00020	
00020	LET	V	DAY OF YEAR	DBT	V	BEGINNING OF YEAR	$S	PERIOD-END-DATE	00030	

Line 00010 calculates the first date of the year that the pay period end date falls. If the pay ends on February 18, 2000, the result in Beginning of Year operand is the date 01 Jan 2000. Line 00020 then calculates how many days there are between 01 Jan 2000 and 18 Feb 2000 (48).