At 18:07 +0100 on 06/28/2014, Steve Hobson wrote about Re: Local Time
conversion to/from UTC Time:
You probably already know this but local time is ambiguous around when the
clocks "go back". That means there is typically a one hour time range each
year within which the local time cannot be converted to UTC without
additional information.
As I mentioned in a prior reply, a 1:xx time stamp occurring after a
2:xx (or an out of order 1:xx one with a large backward jump is a
good hint./indication of the clock roll-back.
