$PBExportHeader$f_rst_mon_1st.srf
$PBExportComments$返回日期
global type f_rst_mon_1st from function_object
end type

forward prototypes
global function datetime f_rst_mon_1st (integer arg_type, long arg_yearmon)
end prototypes

global function datetime f_rst_mon_1st (integer arg_type, long arg_yearmon);//返回月第一天
//f_rst_mon_1st(arg_type,arg_yearmon)
//arg_type
//1:当月第一天 
//2:下月第一天
//3:当月最后一天


datetime rst_next_1st
datetime sdate,edate

select sdate,edate into :sdate,:edate 
from cw_calendar
where accsetid = :sys_accsetid
  and cmonth = :arg_yearmon;	

choose case arg_type
	case 1
		rst_next_1st = sdate
	case 2
		rst_next_1st = datetime(RelativeDate ( date(string(edate,'yyyy-mm-dd')), 1 ),time(0))	
	case 3
		rst_next_1st = datetime(date(string(edate,'yyyy-mm-dd')),time('23:59:59'))
end choose

return rst_next_1st
end function