ConditionExpression's ConditionOperator For Datetime

對於ConditionExpression中用到Datetime類型匹配，嘗試了N種方法，終於找到了合適的解決方案；

new ConditionExpression("gf_establishdate",ConditionOperator.GreaterEqual,(new DateTime(fromYear,fromMonth,fromDay)).ToUniversalTime().ToString())
,new ConditionExpression("gf_establishdate",ConditionOperator.LessEqual,(new DateTime(toYear,toMonth,toDay)).ToUniversalTime().ToString() )

ConditionOperator.GreaterEqual 太於等於
ConditionOperator.LessEqual 小於等於