[tz] Possible DST Discrepancies for Manitoba, Canada

Paul Eggert eggert at cs.ucla.edu
Sun Dec 6 21:58:15 UTC 2015

Rena B wrote:
> The years 1957 - 1963 in the data base for Manitoba.  Winnipeg and Selkirk both switch for those years appropriately, but none of the other Manitoba towns I've tried have.

I'm not sure which database you're talking about; the tz database has just one 
entry for Manitoba, namely America/Winnipeg. As the file 'northamerica' says, 
America/Winnipeg's pre-1970 data is mostly taken from Shanks & Pottenger, which 
says that parts of Manitoba used different rules before 1970. The tzdata cutoff 
is 1970, though, so I ignored the other Manitoba locations. For the ignored data 
you might try consulting Shanks & Pottenger directly, though I should warn you 
their data's reliability is spotty.


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