There is only up 6th on the drop-down list as it is describing the
nth week not the particular day of the month.

To configure the time, log in to the web interface of the ENS202EXT and
click on Time Settings

Check the box beside Enable Daylight Saving.

Set the Start to March/2nd/Sunday/ and offset to 2am (March 8, 2015
02:00) and set the end to November/1st/Sunday/2am (November 1, 2015
02:00)

Click Save/Apply to save the settings.