time_boundaries(sd_​start, sd_end, boundary_type, span_wide)

Find the calendar time-boundaries (e.g. month or year start-dates) between two dates

Finds the serial dates of calendar times within the input date-range. The boundary types can be: 'daily'; 'monthly'; 'quarterly'; 'yearly'; or 'fy' (Australian financial year). An option is available to return boundaries that may span outside the start or end dates (if these aren't on a boundary).