NH-3192 - Port-back register date function in MsSqlCeDialect

Squashed commit of 65f6488 and 203a98f

Author: hazzik

src/NHibernate/Dialect/MsSqlCeDialect.cs

@@ -45,6 +45,14 @@ public MsSqlCeDialect()
 RegisterFunction("substring", new EmulatedLengthSubstringFunction());
 RegisterFunction("str", new SQLFunctionTemplate(NHibernateUtil.String, "cast(?1 as nvarchar)")); 
 
+RegisterFunction("date", new SQLFunctionTemplate(NHibernateUtil.DateTime, "dateadd(dd, 0, datediff(dd, 0, ?1))"));
+RegisterFunction("second", new SQLFunctionTemplate(NHibernateUtil.Int32, "datepart(second, ?1)"));
+RegisterFunction("minute", new SQLFunctionTemplate(NHibernateUtil.Int32, "datepart(minute, ?1)"));
+RegisterFunction("hour", new SQLFunctionTemplate(NHibernateUtil.Int32, "datepart(hour, ?1)"));
+RegisterFunction("day", new SQLFunctionTemplate(NHibernateUtil.Int32, "datepart(day, ?1)"));
+RegisterFunction("month", new SQLFunctionTemplate(NHibernateUtil.Int32, "datepart(month, ?1)"));
+RegisterFunction("year", new SQLFunctionTemplate(NHibernateUtil.Int32, "datepart(year, ?1)"));
+
 DefaultProperties[Environment.ConnectionDriver] = "NHibernate.Driver.SqlServerCeDriver";
 DefaultProperties[Environment.PrepareSql] = "false";
 }