Make sure that the ENH210EXT firmware has been upgrade to version 1.3.7 or newer.
On the GUI go to “Time Settings” under “Management” enable the Daylight Savings Time option.
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.