create new date with yyyy-mm-dd code example

Example 1: Convert a date to yyyy mm dd format

const formatYmd = date => date.toISOString().slice(0, 10);
formatYmd(new Date());

Example 2: python datetime format yyyy-mm-dd

from datetime import datetime
now = datetime.today().isoformat()
print(now) # '2018-12-05T11:15:55.126382'