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Prototype Setters and Getters

Many Date prototype methods can be summarized by the form:

Date.prototype. {get|set}[UTC]{FullYear | Month | Date | Hours |

Minutes | Seconds | Milliseconds}() | {get | set}Time() | get{[UTC]Day | TimezoneOffset}()

The optional [UTC] tag specifies a reference to the Coordinated Universal Time instead of the local time.'Time' refers to the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC. The prefix + may also be used to achieve the same purpose.

'Day' specifies the day number of the week (0-6).'TimezoneOffset' is the offset from Greenwich Mean Time in minutes.


RESETRUNFULL
<!DOCTYPE html><html><body><script>

<!DOCTYPE html><html><body><script>
   var d = new Date('2017-7-16');
   d.setHours(2);
   d.setMinutes(100);
      console.log(d.getFullYear()); // 2017
   console.log(d.getMonth());  // 6
   console.log(d.getDate()); // 18
   console.log(d.getHours()); // 3
   console.log(d.getMinutes());  // 40
      console.log(d.getTime()); // 1500320400000
   console.log(d.getDay());  // 0 (Sunday)
   console.log(d.getUTCDay());  // 6 (Saturday)
   console.log(d.getTimezoneOffset());  // -480 (GMT+8)
   d.setDate( d.getDate() + 1 );  // to the next day</script></body></html>

</script></body><html>
The following shows how to check if something is a valid date.
if ( Object.prototype.toString.call(d) === "[object Date]" ) { // it is a date if ( isNaN( d.getTime() ) ) { // d.valueOf() could also work // date is not valid } else { // date is valid }}else { // not a date}