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Convert Custom Date Format to strftime Format

Source: R/asCDateFmt.R
asCDateFmt.Rd

Translates a custom date format string using tokens like yyyy, mm, dd, mmm, etc. into a valid strftime-compatible format string (C-style).

Usage

asCDateFmt(fmt)

Arguments

fmt

character string. Custom date format.

Value

character string. A valid strftime format.

Details

The function parses the input string sequentially and replaces recognized tokens while leaving all other characters unchanged. This makes it robust to compact formats (e.g. yyyymmdd) and mixed text.

Supported tokens:

  • d, dd, ddd, dddd

  • m, mm, mmm, mmmm

  • y, yy, yyyy

Mapping:

  • yyyy -> \%Y

  • yy, y -> \%y

  • mm, m -> \%m

  • mmm -> \%b

  • mmmm -> \%B

  • dd -> \%d

  • d -> \%e

  • ddd -> \%a

  • dddd -> \%A

Examples

asCDateFmt("yyyy-mm-dd")
#> [1] "%Y-%m-%d"
asCDateFmt("dd.mm.yy")
#> [1] "%d.%m.%y"
asCDateFmt("yyyymmdd")
#> [1] "%Y%m%d"
asCDateFmt("mmm d, yyyy")
#> [1] "%b %e, %Y"