Function parse_strftime_borrowed 

pub fn parse_strftime_borrowed(
    s: &str,
) -> Result<Vec<BorrowedFormatItem<'_>>, InvalidFormatDescription>

Available on crate feature alloc and (crate features formatting or parsing) only.

Parse a sequence of items from the strftime format description.

The only heap allocation required is for the Vec itself. All components are bound to the lifetime of the input.