No matter who you ask in Creston, chances are they've got a pretty definite opinion on Creston's time zone - whether it should match Nelson, or match Cranbrook, or stay the way it is.  The debate has been raging off and on ever since Alberta adopted Daylight Savings Time in 1971.  Today, while looking up a photo for a researcher,  I came across something that made me realise the time zone has been causing headaches for decades longer than that.
The "something" is an excerpt, in Robert Turner's book The Skyline imited, of special rules regarding the track of the Great Northern Railway between Wynndel and Sirdar, dated 1904.  The GNR shared this section of track with the Canadian Pacific Railway, and, since it was actually the CPR's line, CPR rules and schedules applied.

The tricky part was that the CPR was on Mountain Time, and the Great Northern was on Pacific Time.  The "Special Rules" made a point of emphasising that fact, no doubt to avoid the seriously bad day that would result from two trains on two different time zones trying to travel on the same eight miles of track at the same time.  Being late for an appointment in Cranbrook, because you couldn't figure out the time zone, sure seems to pale in comparison!
Creston was on Mountain Time from the adoption of standard time in 1885, until October 1916.  At that time, the CPR switched Creston from the jurisdiction of its Mountain division (Cranbrook/Calgary) to its Pacific division (Nelson/Vancouver), and Creston's time moved back one hour as a result.  We were on Pacific Time for nearly two years, but when Daylight Savings Time was adopted nationally as a war-time energy-saving measure in April 1918, Creston just went back to the way things had always been, and has stayed there ever since.