Finland will switch to daylight saving time or summer time on Sunday morning, i.e. clocks are turned forward an hour at 3am (3am > 4am).
Early morning bus services, i.e. Saturday service will run on winter time. Beginning from Sunday morning service, transport services operate on summer time. There will be additional bus services on the night of Saturday to Sunday.
Additional bus services when switching to summer time
Commuter trains leaving after 4am will mainly run on summer time.
There are, however, some changes to L, N and T trains:
The 3.47am L train and 4.01am T train from Helsinki will run on winter time.
The 3.45am N train from Kerava to Helsinki will not run because there will be a T train from Kerava to Helsinki at 4.49am (summer time).