This code is Date to datetime conversion in axapta. Try this way.
date fromDate ;
Timezone timezone = DateTimeUtil::getUserPreferredTimeZone();
;
fromDate=mkdate(1,mthofyr(str2date('1/9/2009',123)),Year(str2date('1/9/2009',123)));
abc.DateTime1>= datetobeginUtcDateTime(fromDate,timezone)