Function parse_calendar_year_century_standard_range 

pub(crate) fn parse_calendar_year_century_standard_range(
    input: &[u8],
    modifiers: CalendarYearCenturyStandardRange,
) -> Option<ParsedItem<'_, (i16, bool)>>

Available on crate feature parsing only.

Parse all digits of the calendar-based year except the last two.

This only supports two digits in order to avoid parsing ambiguities, so it cannot utilize the full range of supported years when the large-dates feature flag is enabled.