Answers for "moment js set year month day"

moment js add day

var new_date = moment(startdate, "DD-MM-YYYY").add(5, 'days');

Moment js get first and last day of current month

const startOfMonth = moment().startOf('month').format('YYYY-MM-DD hh:mm');
const endOfMonth   = moment().endOf('month').format('YYYY-MM-DD hh:mm');

moment get month day

//The correct function to use is .date():

date.date() === 25;