Recurrence date/time and timezone validation rules

[allenporter]

Is your feature request related to a problem? Please describe. There are explicit rules in https://www.rfc-editor.org/rfc/rfc5545#section-3.3.10 that describe the validations that need to happen for recurrence dates and timezones which are not implemented. These are across objects, so a little more complicated to validate, but can likely happen in the parent component.

• [ ] Recurrence timezone formattings
• [ ] Recurrence datetime field encoded properly
• [x] Verify start date format is the same as the event
• [ ] Verify daylight saving time in until and start is the same

Also verify that recurrence dates and date times are encoded properly while here.

[allenporter]

Tests are needed to ensure that recurring all day events are expanded with the right timezone rules