time

pub fn date_of(t: f64) -> (i64, usize, u32)

A decimal year back to (year, month, day).

pub fn is_time_name(key: &str) -> bool

Whether a column name says it holds times (so bare years count).

pub fn period(s: &str) -> Option<f64>

One period as a decimal year. 2010-11 reads as November 2010 here: use periods for a whole column, which can tell financial years.

pub fn periods<'a>(values: impl IntoIterator<Item = &'a str>) -> Vec<Option<f64>>

A column of periods. 2010-11, 2011-12 could be months, so they're financial years only when every value in the column could be one.

pub fn year_of(y: i64, m: usize, d: u32) -> Option<f64>

(year, month, day) as a decimal year.