My favorite Clock widget for the Galaxy S4 would be the Thalion clock.  Once you download and install the Thalion clock app, setting it up is very easy.  Go into your widgets screen and select the size of the Thalion clock you want and then press hold to drag it to the android desktop.   This widget should also be compatible with the HTC One too as the HTC One is an android phone. best galaxy s4 clock widgets Thalion Clock - screenshot thumbnailThalion Clock - screenshot thumbnailThalion Clock - screenshot thumbnail

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https://play.google.com/store/apps/details?id=pl.thalion.mobile.thalion.analog.alarm.clock custom roms liquid smooth galaxy s4 battery life screenshots