js time function code example

Example 1: javascript count time

// The getTime() method returns the number of milliseconds since midnight of January 1, 1970.


var start = new Date().getTime();

for (i = 0; i < 50000; ++i) {
// do something
}

var end = new Date().getTime();
var time = end - start;
alert('Execution time: ' + time);

Example 2: javascript set delay

var delayInMilliseconds = 1000; //1 second

setTimeout(function() {
  //your code to be executed after 1 second
}, delayInMilliseconds);

Example 3: js date methods

var d= new Date();
d.getFullYear();	//Get the year as a four digit number (yyyy)
d.getMonth();	//Get the month as a number (0-11)
d.getDate();	//Get the day as a number (1-31)
d.getHours();	//Get the hour (0-23)
d.getMinutes();	//Get the minute (0-59)
d.getSeconds();	 //Get the second (0-59)
d.getMilliseconds()	//Get the millisecond (0-999)
d.getTime();	//Get the time (milliseconds since January 1, 1970)
d.getDay();  //Get the weekday as a number (0-6)
d.Date.now();	//Get the time. ECMAScript 5.
d.setDate()	//Set the day as a number (1-31)
d.setFullYear()	//Set the year (optionally month and day)
d.setHours()	//Set the hour (0-23)
d.setMilliseconds()	//Set the milliseconds (0-999)
d.setMinutes()	//Set the minutes (0-59)
d.setMonth()	//Set the month (0-11)
d.setSeconds()	//Set the seconds (0-59)
d.setTime()	//Set the time (milliseconds since January 1, 1970)

Example 4: timer in javascript

//single event i.e. alarm, time in milliseconds
var timeout = setTimeout(function(){yourFunction()},10000);
//repeated events, gap in milliseconds
var interval = setInterval(function(){yourFunction()},1000);

Example 5: js time

Pulling Date and Time Values
getDate()
Get the day of the month as a number (1-31)
getDay()
The weekday as a number (0-6)
getFullYear()
Year as a four digit number (yyyy)
getHours()
Get the hour (0-23)
getMilliseconds()
The millisecond (0-999)
getMinutes()
Get the minute (0-59)
getMonth()
Month as a number (0-11)
getSeconds()
Get the second (0-59)
getTime()
Get the milliseconds since January 1, 1970
getUTCDate()
The day (date) of the month in the specified date according to universal time (also available for
day, month, fullyear, hours, minutes etc.)
parse
Parses a string representation of a date, and returns the number of milliseconds since January

Example 6: js time function

const t0 = performance.now();
doSomething();
const t1 = performance.now();
console.log(`Call to doSomething took ${t1 - t0} milliseconds.`);