minor, provide alternative format specifiers, -f and -i take the literal string `ymd' and `ymcw' now
minor, provide alternative format specifiers, -f and -i take the literal string `ymd' and `ymcw' now

Signed-off-by: Sebastian Freundt <1f0829204b3475c52f714f96be4e7b39a87b6e74@ga-group.nl>

rudimeier/dateutils,rudimeier/dateutils,rudimeier/dateutils