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How to Display JavaScript DateTime in 12 Hour AM/PM Format?

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Sometimes, we may want to display a JavaScript date-time in 1 hour AM/PM format.

In this article, we’ll look at how to format a JavaScript date-time into 12 hour AM/PM format.

Create Our Own Function

One way to format a JavaScript date-time into 12 hour AM/PM format is to create our own function.

For instance, we can write:

const formatAMPM = (date) => {
  let hours = date.getHours();
  let minutes = date.getMinutes();
  let ampm = hours >= 12 ? 'pm' : 'am';
  hours = hours % 12;
  hours = hours ? hours : 12;
  minutes = minutes.toString().padStart(2, '0');
  let strTime = hours + ':' + minutes + ' ' + ampm;
  return strTime;
}

console.log(formatAMPM(new Date(2021, 1, 1)));

We have the formatAMPM function that takes a JavaScript date object as a parameter.

In the function, we call getHours tio get the hours in 24 hour format.

minutes get the minutes.

Then we create the ampm variable and it to 'am' or 'pm' according to the value of hours .

And then we change the hours to 12 hour format by using the % operator to get the remainder when divided by 12.

Next, we convert minutes to a string with toString and call padStart to pad a string with 0 if it’s one digit.

Finally, we put it all together with strTime .

So when we log the date, we get:

12:00 am

Date.prototype.toLocaleString

To make formatting a date-time to AM/PM format easier, we can use the toLocaleString method.

For instance, we can write:

const str = new Date(2021, 1, 1).toLocaleString('en-US', {
  hour: 'numeric',
  minute: 'numeric',
  hour12: true
})
console.log(str);

We call toLocaleString on our date object with the locale and an object with some options.

The hour property is set to 'numeric' to display the hours in numeric format.

This is the same with minute .

hour12 displays the hours in 12-hour format.

So str is ‘1’2:00 AM’ as a result.

Date.prototype.toLocaleTimeString

We can replace toLocaleString with toLocaleTimeString and get the same result.

For instance, we can write:

const str = new Date(2021, 1, 1).toLocaleTimeString('en-US', {
  hour: 'numeric',
  minute: 'numeric',
  hour12: true
})
console.log(str);

And we get the same result.

moment.js

We can also use moment.js to format a date object into a 12-hour date-time format.

To do this, we call the format method.

For example, we can write:

const str = moment(new Date(2021, 1, 1)).format('hh:mm a')
console.log(str);

And we get the same result as before.

a adds the AM/PM.

hh is the formatting code for a 2 digit hour.

mm is the formatting code for a 2 digit minute.

Conclusion

We can format a JavaScript date-time to 12-hour format with vanilla JavaScript or moment.js.

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