主题：多个日期比较

Dim min As Date = DataTables("早餐登记").Compute("Max(用餐日期)","客户id = '" & e.DataRow("客户ID") & "'")
Dim m1 As Date = DataTables("客房订单").Compute("Max(入住日期)","客户id = '" & e.DataRow("客户ID") & "'")
Dim m2 As Date = DataTables("接机登记").Compute("Max(接机日期)","客户id = '" & e.DataRow("客户ID") & "'")
Dim m3 As Date = DataTables("景点预订").Compute("Max(出发日期)","客户id = '" & e.DataRow("客户ID") & "'")
e.DataRow("最早日期") =

请问这个最早日期怎么求哇~~~不会写了~