All relevant timezone information for a given period, i.e. Europe/Moscow on March 3rd, 2013

Notes: - full_name is the name of the zone, but does not indicate anything about the current period (i.e. CST vs CDT) - abbreviation is the abbreviated name for the zone in the current period, i.e. "America/Chicago" on 3/30/15 is "CDT" - offset_std is the offset in minutes from standard time for this period - offset_utc is the offset in minutes from UTC for this period Spec: - day_of_week: :sunday, :monday, :tuesday, etc - datetime: {{year, month, day}, {hour, minute, second}} - from: :min | :max | {day_of_week, datetime}, when this zone starts - until: :min | :max | {day_of_week, datetime}, when this zone ends