channel://pear.horde.org/Horde_Date-1.0.11 can optionally use package "channel://pear.horde.org/Horde_Icalendar" (version >= 1.0.0, version <= 2.0.0, excluded versions: 2.0.0)
channel://pear.horde.org/Horde_Date-1.0.11 can optionally use PHP extension "calendar"
