pub fn parse_period(period: &str) -> Result<(NaiveDate, NaiveDate), String>Expand description
Parse a calendar-period shortcut into an inclusive
(start, end) range.
Accepted forms (case-insensitive on the suffix):
YYYY— the full calendar year.YYYYQ1/Q2/Q3/Q4— that calendar quarter.YYYYH1/H2— the first or second half of the year.