Javascript get current timetamp
//gets the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC
Date.now()
Simply Date.now() returns the number of milliseconds that has elapsed since January 1, 1970 00:00:00 UTC.
You maybe asking why January 1, 1970 00:00:00 UTC. January 1, 1970 00:00:00 UTC is an arbitrary date set by Unix engineers as a uniform/standard date for the beginning of time.
Get day of the month
new Date().getDate()
Get Day of the week
new Date().getDay();
Get Month of the year
//returns month of the year zero based month+1
new Date().getMonth();