BW - Beginning of Week 
Beginning of Week (BW) will return the 1st day of the week (Sunday) of the date found in Operand 2. 
Statement:			If an employee is terminated in the 1st week of the pay period, divide the Life Plan deduction collected in half (the deduction is stored in PC 1700).
||Line||CMD||OT||Operand 1||OPER||OT||Operand2||OT||Operand3||If Goto||	Else GoTo
00010	IF	DB	DES.STATUS_CODE	EQ	A	TERMINATED			00100	99999
00100	LET	V	WEEK 1 END DATE	BW	$S	PERIOD-END-DATE			00110	
00110	IF	DB	EEM.TERMINATION_DATE	GE	$S	PERIOD_START_DATE			00200	99999
00200	IF	DB	EEM.TERMNIATION_DATE	LE	V	WEEK 1 END DATE			00300	99999
00300	IF	PC	1700	GT	N	0			00400	99999
00400	LET	PC	1700	DIV	PC	1700	N	2	99999	
99999	EXIT								99999	

As with BD, the result of BW may also be changed by a value in Operand 3. 
Refer to BD in Section 6.5.2. for possible Operand 3 values.