converting Date object to TimeWithZone

Question

I need to convert a Date object into a TimeWithZone object representing the beginning of that day in a given time zone.

The following approach works, but seems too c

Answer 1

Subtract utc_offset:

d = Date.today
Time.zone.class.all.map(&:name).map { |tz| dt = d.to_datetime.in_time_zone(tz); dt -= dt.utc_offset }

Using ActiveSupport::TimeZone[tz] doesn't take daylight savings time into account.

Time.zone.class.all.map(&:name).map { |tz| o = d.to_datetime.in_time_zone(tz).utc_offset - ActiveSupport::TimeZone[tz].utc_offset }