$PBExportHeader$f_get_month_days.srf
global type f_get_month_days from function_object
end type

forward prototypes
global function integer f_get_month_days (long arg_mth, ref long arg_ref_days, ref string arg_msg)
end prototypes

global function integer f_get_month_days (long arg_mth, ref long arg_ref_days, ref string arg_msg);Int rslt = 1
Long ll_year,ll_month,ll_lastday
Boolean ifyear = FALSE

ll_month = Long(Right(String(arg_mth),2))
IF Not (ll_month >= 1 AND ll_month <= 12) THEN
	arg_msg = '非法的月份'
	rslt = 0
	GOTO ext
END IF


ll_year = Long(Left(String(arg_mth),4))


IF Mod(ll_year,4) <> 0 THEN
	ifyear = FALSE
ELSEIF Mod(ll_year,100) <> 0 THEN
	ifyear = TRUE
ELSEIF Mod(ll_year,400) <> 0 THEN
	ifyear = FALSE
ELSE
	ifyear = TRUE
END IF

CHOOSE CASE ll_month
	CASE 1,3,5,7,8,10,12
		ll_lastday = 31
	CASE 2
		IF ifyear THEN
			ll_lastday = 29
		ELSE
			ll_lastday = 28
		END IF
	CASE 4,6,9,11
		ll_lastday = 30
END CHOOSE

arg_ref_days = ll_lastday

ext:
RETURN rslt



end function