BM - Beginning of Month 
Beginning of Month (BM) will return the 1st day of the month of the date found in Operand 3.
Statement:			Find the 1st day of the month that the employee was hired and store it into the Variable 1st of Hire Month.
Line	CMD	OT	Operand 1	OPER	OT	Operand2	OT	Operand3	If Goto	Else GoTo
00010	LET	V	1ST OF HIRE MONTH	BM	DB	EEM.HIRE_DATE			00020	

In the example above, if an employee was originally hired on May 17, 1979, the value returned to 1st of Hire Month would be May 1, 1979.
As with BD, the BM result may also be changed by a value in Operand 3. 
	Refer to BD in section 6.5.2. For possible Operand 3 values.