SDF 2.0 continues to have functionality for working with the time and time zones for devices.  The differences from SDF 1.x are a namespace change, a classname change (don't believe the beta docs or the beta, these have changed since that drop), and under the hood a lot more internal checks are going on to head off errors and to provide correct device support.  Basically this one has been pretty heavily tested across a broad range of devices.

Some quick highlights:

Getting and Displaying a List of Time Zones

using OpenNETCF.WindowsCE;
...
// get and display all available zones
TimeZoneCollection tzc = new TimeZoneCollection();
tzc.Initialize();

foreach (TimeZoneInformation tzi in tzc)
{
    lstZones.Items.Add(tzi);
}

Displaying the Currently Set Time Zone

using OpenNETCF.WindowsCE;
...
// get and display the currrent zone
TimeZoneInformation currentTz = new TimeZoneInformation();
DateTimeHelper.GetTimeZoneInformation(ref currentTz);
lblCurrentZone.Text = currentTz.StandardName;

Setting the Current Time Zone (from the Listing above)

using OpenNETCF.WindowsCE;
...
if (lstZones.SelectedItem != null)
{
    TimeZoneInformation tzi = (TimeZoneInformation)lstZones.SelectedItem;
    DateTimeHelper.SetTimeZoneInformation(tzi);

    // this verifies that the time zone did indeed get changed
    TimeZoneInformation tz = new TimeZoneInformation(
        (byte[])Registry.LocalMachine.OpenSubKey("Time").GetValue(
            "TimeZoneInformation"));
    MessageBox.Show("Current Timezone in Registry is:\r\n" 
        + tz.StandardName, "Verified");
}

Displaying the Current Time (without DateTime.Now)

using OpenNETCF.WindowsCE;
...
DateTime dt = DateTimeHelper.SystemTime;

txtHour.Text = dt.Hour.ToString();
txtMinute.Text = string.Format("{0:00}", dt.Minute);
txtSecond.Text = string.Format("{0:00}", dt.Second);

Setting The Current System Time (Local Time is Analogous)

using OpenNETCF.WindowsCE;
...
// get the current time so we can copy the date part
DateTime dt = DateTimeHelper.SystemTime;

DateTimeHelper.SystemTime = new DateTime(dt.Year, dt.Month, dt.Day,
    int.Parse(txtHour.Text), int.Parse(txtMinute.Text), int.Parse(txtSecond.Text));