If the symbol appears next to the clock, it indicates that the City / Country is in daylight saving time.
If the clock does not display the DST symbol, it is winter time or does not use daylight saving time.
The hours +1h. +2h. etc. or -1h. -2h. etc. next to the locality, indicate the current time zone or UTC/GMT (Universal Time/Grenwich Meridian) of the City / Country, including the DST if the locality is using it.