VERSION$Revision: 1.61 $
$d = Date::ICal::Duration->new( ical => '-P1W3DT2H3M45S' );
$d = Date::ICal::Duration->new( weeks => 1,
days => 1,
hours => 6,
minutes => 15,
seconds => 45);
# a one hour duration, without other components
$d = Date::ICal::Duration->new( seconds => "3600");
# Read-only accessors:
# TODO: Resolve sign() discussion from rk-devel and update synopsis.
$d->as_seconds (); # returns just seconds
$d->as_elements (); # returns a hash of elements, like the accessors above
$d->as_ical(); # returns an iCalendar duration string
DESCRIPTIONThis is a trivial class for representing duration objects, for doing math in Date::ICal
AUTHORRich Bowen, and the Reefknot team (www.reefknot.org)
Last touched by $Author: rbowen $
METHODSDate::ICal::Duration has the following methods available:
newA new Date::ICal::Duration object can be created with an iCalendar string :
my $ical = Date::ICal::Duration->new ( ical => 'P3W2D' ); # 3 weeks, 2 days, positive direction my $ical = Date::ICal::Duration->new ( ical => '-P6H3M30S' ); # 6 hours, 3 minutes, 30 seconds, negative direction
Or with a number of seconds:
my $ical = Date::ICal::Duration->new ( seconds => "3600" ); # one hour positive
Or, better still, create it with components
my $date = Date::ICal::Duration->new ( weeks => 6, days => 2, hours => 7, minutes => 15, seconds => 47, sign => "+" );
The sign defaults to ``+'', but ``+'' and ``-'' are legal values.
sign, weeks, days, hours, minutes, secondsRead-only accessors for the elements of the object.
as_secondsReturns the duration in raw seconds.
WARNING --- this folds in the number of days, assuming that they are always 86400 seconds long (which is not true twice a year in areas that honor daylight savings time). If you're using this for date arithmetic, consider using the add() method from a Date::ICal object, as this will behave better. Otherwise, you might experience some error when working with times that are specified in a time zone that observes daylight savings time.
$days = $duration->as_days;
Returns the duration as a number of days. Not to be confused with the "days" method, this method returns the total number of days, rather than mod'ing out the complete weeks. Thus, if we have a duration of 33 days, "weeks" will return 4, "days" will return 5, but "as_days" will return 33.
Note that this is a lazy convenience function which is just weeks*7 + days.
as_icalReturn the duration in an iCalendar format value string (e.g., ``PT2H0M0S'')
as_elementsReturns the duration as a hashref of elements.
INTERNALShead2 GENERAL MODEL
Internally, we store 3 data values: a number of days, a number of seconds (anything shorter than a day), and a sign (1 or -1). We are assuming that a day is 24 hours for purposes of this module; yes, we know that's not completely accurate because of daylight-savings-time switchovers, but it's mostly correct. Suggestions are welcome.
NOTE: The methods below SHOULD NOT be relied on to stay the same in future versions.
_set_from_ical ($self, $duration_string)Converts a RFC2445 DURATION format string to the internal storage format.
_parse_ical_string ($string)Regular expression for parsing iCalendar into usable values.
_set_from_components ($self, $hashref)Converts from a hashref to the internal storage format. The hashref can contain elements ``sign'', ``weeks'', ``days'', ``hours'', ``minutes'', ``seconds''.
_set_from_ical ($self, $num_seconds)Sets internal data storage properly if we were only given seconds as a parameter.
$self->_hms();Return an arrayref to hours, minutes, and second components, or undef if nsecs is undefined. If given an arrayref, computes the new nsecs value for the duration.
$self->_wd()Return an arrayref to weeks and day components, or undef if ndays is undefined. If Given an arrayref, computs the new ndays value for the duration.