Extract previous month from current date using timeDate library

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I'm using the timeDate library instead of lubridate because it appears easier to determine when certain stock markets are open.

Given the current date, how do I extract the previous month in numeric form?

So if the current date is: "2022-12-09

prev_month = 11

And if the current date is: "2023-01-03"

prev_month = 12

library("timeDate")
current_date <- as.timeDate(Sys.Date())
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library(timeDate)
if (match(months(dt), month.name) == 1) 12  else  match(months(dt), month.name) - 1

month.name is an object in base R containing the full month names. By using match, you can convert between the month names and month numbers.

As months cycle from 1 to 12, when you step back from 1, you need to go to 12, not 0, hence the if statement for this special case.