PERIOD value types

[niccokunzmann]

Describe the bug

The ICS standard suggests the period type can be used for

• DTSTART
• RDATE
• more?

RFC 5545, pages 36, 120

HELP!

I need at last one ICS file first before I an test that particular type of data.

Also, please comment:
It seems rare that a PERIOD is encountered. People using this module will most likely not test for that rare instance.
My suggestion is because of that,

• that the DTSTART and the DTEND both have a datetime/date as a value and not a PERIOD type
• AND/OR that we provide test data for other people so that they can test for these rare cases.

What do you think?

Suggested implementation

• add an ICS file
• add a test
• implement the test
• fix the test

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[niccokunzmann]

See also:

• Support RDATE;VALUE=PERIOD pimutils/khal#152
• Better support for RDATE with VALUE=PERIOD collective/icalendar#156
  This adds the neccesary ICS files, too to use in the tests.

[niccokunzmann]

#114 #113 yield the case of RDATE being a PERIOD.

The default value type is DATE-TIME. The time value MUST be one of the forms defined for the DATE-TIME value type. The value type can be set to a DATE value type.

• https://www.kanzaki.com/docs/ical/dtstart.html

This can be closed.