Description Usage Arguments Examples
Checks:
is list of date vectors of length 2
first element is first day of quarter
second element is one quarter later than first (if neither NA)
intervals do not overlap
| 1 2 3 | 
| x | A list of Date vectors, each of which has length 2. | 
| name | The name for  | 
| 1 2 3 4 | 
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