For more details on conversion specifiers please refer to
the manual page of strptime
. Most of the formatters
of the form %x
, where x
is a letter, are supported.
Moreover, each %%
is replaced with %
.
Warnings are given in the case of %x
, %X
, %u
,
%w
, %g
, %G
, %c
, %U
, and %W
as in such circumstances either ICU does not
support the functionality requested using the string format API
or there are some inconsistencies between base R and ICU.