Open Source Ecosystems

Similar to Dates' firstdayof* and lastdayof*, I introduce to you penultimatedayof*; a useful function to find the second-to-last day of a measure of time.

Unlike Dates' *dayof* functions, I have extended functionality to find, for example, the penultimate Tuesday of a measure of time. We have also extended some of Dates' *dayof* functions to allow this functionality.

See also jakewilliami/pt for a command-line implementation using logic from this package.

Quick Start

julia> using Dates, PenultimateDays

julia> d = today()
2022-06-24

julia> penultimatedayofweek(d)  # second-to-last day of the week
2022-06-25

julia> penultimatedayofmonth(d)  # second-to-last day of the month
2022-06-29

julia> penultimatedayofmonth(d, Tuesday)  # second-to-last Tuesday of the month
2022-06-21

julia> penultimatedayofquarter(d)  # second-to-last day of the quarter
2022-06-29

julia> penultimatedayofquarter(d, Tuesday)  # second-to-last Tuesday of the quarter
2022-06-21

julia> penultimatedayofyear(d)  # second-to-last day of the year
2022-12-31

julia> penultimatedayofyear(d, Tuesday)  # second-to-last Tuesday of the year
2022-12-20

Extending the Dates standard library

We have also extended the Dates standard library to allow specification of day for *dayof* functions:

julia> using Dates, PenultimateDays

julia> d = today()
2022-06-24

julia> firstdayofmonth(d, Tuesday)
2022-06-07

julia> lastdayofmonth(d, Tuesday)
2022-06-28