HSL

If you're looking for the most up-to-date timetables, you can find those here. 

Before 2010, Helsinki bus, tram, ferry and metro timetables were published by HKL, all other bus timetables were published by YTV and commuter train timetables were published by VR.

HSL produces two distinct sets of timetables: the winter timetables and the summer timetables. The winter timetables come into effect on the second or third Monday of August and last until the third Sunday of the following June (the first Sunday in previous years). The summer timetables cover the two months in between. Most major route changes occur at the end of the summer, with more minor timetable changes taking place on the 1st of January.

In Joukkola, timetables are listed as either "Summer XXXX" or "Winter XXX1-XXX2". Timetables starting at the start of the year are listed as "Winter-Spring XXXX".