Edit

IsSameOrBefore

IsSameOrBefore adds .isSameOrBefore() API to returns a boolean indicating if a date is same or before another date.

var isSameOrBefore = require("dayjs/plugin/isSameOrBefore");
// import isSameOrBefore from 'dayjs/plugin/isSameOrBefore' // ES 2015

dayjs.extend(isSameOrBefore);

dayjs("2010-10-20").isSameOrBefore("2010-10-19", "year");