Day-of-month with ordinal suffix.

[mbostock]

This implementation is limited to ordinal as a suffix, so it won’t support ordinal indicators as prefixes.

TODO

• [x] Pick a directive (%o).
• [x] Format ordinal day-of-month in en-US locale.
• [ ] Format ordinal day-of-month in other locales?
• [ ] Allow the ordinal to be a prefix instead of a suffix, such as for Chinese?
• [ ] Decide how to parse ordinal day-of-month?
• [ ] It’s icky that the locale now contains code rather than being strictly declarative.
• [ ] Is there a better way to reuse logic across locales?

[mbostock]

It appears the strftime npm package uses %o for ordinal day-of-month, too. Yay.

[raags]

Any reason why this hasn't been merged?