The following table explains the mapping:

Map to MSS Date Time (Checked/ Unchecked) Data type Corresponding Legacy/MSSQL Server 2008 compatible data type
Checked (mapping provides backwards compatibility to earlier versions of MS SQL Server)
Date DateTime
DateTime DateTime datatype
Unchecked (Use Date, DateTime2 and DateTimeOffset datatypes introduced in MSSQL Server 2008 )
Date Date
DateTime DateTime2
DateTime-TZ DateTimeOffset