Within how many hours a day completes in Austria?

Question

some says that a day & night is for 23 hours only

Answer 1

No. No. No.

Everywhere in the world, a day is 24 hours, unless daylight savings time happens (therefore, even in parts of the world with DST, a day is 24 hours 363+ days of the year)

Answer 2

On the day that daylight saving starts, there is only 23 hours in that day.  And on the day it ends, there are 25 hours.  The other 363 days are 24 hours, everywhere in the world.