in src/utils/date.js [3:15]
export function getOrdinalSuffix(day) {
if (day > 3 && day < 21) return 'th';
switch (day % 10) {
case 1:
return 'st';
case 2:
return 'nd';
case 3:
return 'rd';
default:
return 'th';
}
}