Specification of Day Planner-specific additions to iCalendar
by Eskild Hustvedt
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Index:
1 - Birthdays

1 - Birthdays
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Day Planner defines birthdays with additional settings. It is fully
compatible with iCalendar and has a iCalendar-standard SUMMARY tag
containing the name of the person and a localized birthday string.
But in addition to that it includes additional options in order to
support dynamic re-localization of strings. It sets:

X-DP-BIRTHDAY:TRUE
X-DP-BIRTHDAYNAME:[NAME]

X-DP-BIRTHDAYNAME is set to the name of the person whose birthday it is,
and quoted according to iCalendar quoting standards.

Newer versions of Day Planner (0.7 and later) also sets:
X-DP-BORNATDTSTART:TRUE
This means that DTSTART is the date the person in question was born.
One should assume DTSTART is not if this isn't set.