From your short example "šetci plaťá" it looks somehow familiar to me, and as I guess It can be dialect. But I am sure just about it is not from eastern Slovakia where I come from.
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October 19, 2014
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well, "počas večera" is OK, "vo večere" is not so clear and more common is just to say "večer". If you ment "in the evenig" like I wil do it ...
Urobím to večer (or) počas večera.
And "vo večere" I literally see "in the dinner" :-)