dayjs
Version:
2KB immutable date time library alternative to Moment.js with the same modern API
9 lines (8 loc) • 316 B
JavaScript
export default (function (o, c, d) {
var proto = c.prototype;
proto.dayOfYear = function (input) {
// d(this) is for badMutable
var dayOfYear = Math.round((d(this).startOf('day') - d(this).startOf('year')) / 864e5) + 1;
return input == null ? dayOfYear : this.add(input - dayOfYear, 'day');
};
});