A CalendarPeriod represents the abstract concept of a time period that has a canonical start. Grammatically, "the start of the current CalendarPeriod." All calendar times begin at midnight UTC.
Enums
CALENDAR_PERIOD_UNSPECIFIED
Undefined period, raises an error.
DAY
A day.
WEEK
A week. Weeks begin on Monday, following ISO 8601.
FORTNIGHT
A fortnight. The first calendar fortnight of the year begins at the start of week 1 according to ISO 8601.
MONTH
A month.
QUARTER
A quarter. Quarters start on dates 1-Jan, 1-Apr, 1-Jul, and 1-Oct of each year.
HALF
A half-year. Half-years start on dates 1-Jan and 1-Jul.
