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# Datetime Support Functions

## Business Day Functions

`busdaycalendar` | A business day calendar object that efficiently stores information defining valid days for the busday family of functions.
`is_busday`(dates[, weekmask, holidays, ...]) | Calculates which of the given dates are valid days, and which are not.
`busday_offset`(dates, offsets[, roll, ...]) | First adjusts the date to fall on a valid day according to the `roll` rule, then applies offsets to the given dates counted in valid days.
`busday_count`(begindates, enddates[, ...]) | Counts the number of valid days between begindates and enddates, not including the day of enddates.

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