Time.force_zone!

# File tmp/rubies/ruby-3.0.5/lib/time.rb, line 119
def force_zone!(t, zone, offset=nil)
  if zone_utc?(zone)
    t.utc
  elsif offset ||= zone_offset(zone)
    # Prefer the local timezone over the fixed offset timezone because
    # the former is a real timezone and latter is an artificial timezone.
    t.localtime
    if t.utc_offset != offset
      # Use the fixed offset timezone only if the local timezone cannot
      # represent the given offset.
      t.localtime(offset)
    end
  else
    t.localtime
  end
end