Beginning of Daylight (BOD) and End of Daylight (EOD) details are displayed on the Terminal page for any waypoint.
Tap Terminal and navigate to the waypoint/place (you could use the search function - tap the 'book' icon in the top right of the Terminal page, or you could tap on a row in your flight log).
The BOD/EOD will be displayed in UTC near the top of the page, just below the Lat/Long figures.
Note: the BOD/EOD calculation is only applicable for the day you are actually viewing the page, it does not change according to your ETD (for example, if you were planning a flight several weeks/months into the future).