1var today = new Date();
2var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
3

1// `date` is a Date object
2const dayOfYear = date => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / (1000 * 60 * 60 * 24));
3
4// Example
5dayOfYear(new Date(2020, 04, 16));      // 137

1let dateObj = new Date();
2
3let myDate = (dateObj.getUTCFullYear()) + "/" + (dateObj.getMonth() + 1)+ "/" + (dateObj.getUTCDate());