HELP: zoneinfo
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2018 timezone information for: America/Mazatlan

timezone: America/Mazatlan, abbreviation: MST (daylight/summer: MDT)
comments: Mountain Time - Baja California Sur, Nayarit, Sinaloa

country: Mexico (MX) flag of Mexico
default latitude: 23.21666 degrees (north tropical), default longitude: -106.41666 degrees (west)

standard time offset from UTC: -7:00 (before UTC), DST time offset from UTC: -6:00 (before UTC)
DST adds 1 hour from the first Sunday in April at 2:00 AM to the last Sunday in October at 2:00 AM and is currently active.

transitions in 2018:
std: (MST) -7:00 (before UTC) @ the beginning of 2018
dst: (MDT) -6:00 (before UTC) @ Sun, Apr 1, 2018 2:00
std: (MST) -7:00 (before UTC) @ Sun, Oct 28, 2018 2:00

adjustments during 2018:
+1:00 on the first Sunday in April at 2:00 AM
-1:00 on the last Sunday in October at 2:00 AM

A + after the timezone name means that it is the same timezone the server assumes you're using.

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