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module RiCal
class PropertyValue
class DateTime
#- ©2009 Rick DeNatale, All rights reserved. Refer to the file README.txt for the license
#
# Time zone related methods for DateTime
module TimezoneSupport
# Return the timezone id of the receiver, or nil if it is a floating time
def tzid
@tzid == :floating ? nil : @tzid
end
def tzid=(timezone_id) #:nodoc:
timezone_id = default_tzid if timezone_id == :default
@tzid = timezone_id
reset_cached_values
end
def reset_cached_values #:nodoc:
@timezone = @utc = @rational_tz_offset = nil
end
def find_timezone #:nodoc:
if @tzid == :floating
FloatingTimezone
else
timezone_finder.find_timezone(@tzid)
end
end
def timezone #:nodoc:
@timezone ||= find_timezone
end
# Determine if the receiver has a local time zone, i.e. it is not a floating time or a UTC time
def has_local_timezone?
tzid && tzid.upcase != "UTC"
end
# Return the receiver if it has a floating time zone already,
# otherwise return a DATETIME property with the same time as the receiver but with a floating time zone
def with_floating_timezone
if @tzid == nil
self
else
@date_time_value.with_floating_timezone.to_ri_cal_date_time_value
end
end
# Returns a instance that represents the time in UTC.
def utc
if has_local_timezone?
@utc ||= timezone.local_to_utc(self)
else # Already local or a floating time
self
end
end
def rational_tz_offset #:nodoc:
if has_local_timezone?
@rational_tz_offset ||= timezone.rational_utc_offset(@date_time_value.to_datetime)
else
@rational_tz_offset ||= RiCal.RationalOffset[0]
end
end
# Predicate indicating whether or not the instance represents a ZULU time
def utc?
tzid == "UTC"
end
# Predicate indicating whether or not the instance represents a floating time
def floating?
tzid.nil?
end
def has_valid_tzinfo_tzid? #:nodoc:
if tzid && tzid != :floating
TZInfo::Timezone.get(tzid) rescue false
else
false
end
end
# Returns the simultaneous time in the specified zone.
def in_time_zone(new_zone)
new_zone = timezone_finder.find_timezone(new_zone)
return self if tzid == new_zone.identifier
if has_local_timezone?
new_zone.utc_to_local(utc)
elsif utc?
new_zone.utc_to_local(self)
else # Floating time
DateTime.new(timezone_finder, :value => @date_time_value, :tzid => new_zone.identifier)
end
end
end
end
end
end
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