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

forward prototypes
global function integer f_get_month_day (long arg_mth, integer arg_type, ref datetime arg_ref_datetime, ref string arg_msg)
end prototypes

global function integer f_get_month_day (long arg_mth, integer arg_type, ref datetime arg_ref_datetime, ref string arg_msg);Int rslt = 1
Long ll_year,ll_month,ll_lastday
Boolean ifyear = FALSE

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

CHOOSE CASE arg_type
	CASE 0 //当月第一天
		arg_ref_datetime = datetime(date(string(ll_year,'0000') + '-'+string(ll_month,'00') + '-01'),time(0))

	CASE 1 //当月最后一天
		
		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_datetime = datetime(date(string(ll_year,'0000') + '-'+string(ll_month,'00') + '-'+string(ll_lastday,'00')),time('23:59:59'))

END CHOOSE

ext:
RETURN rslt


end function