Answers for "js add 24 hours to date"

convert 24 hours to 12 hours javascript

function tConvert (time) {
  // Check correct time format and split into components
  time = time.toString ().match (/^([01]\d|2[0-3])(:)([0-5]\d)(:[0-5]\d)?$/) || [time];

  if (time.length > 1) { // If time format correct
    time = time.slice (1);  // Remove full string match value
    time[5] = +time[0] < 12 ? 'AM' : 'PM'; // Set AM/PM
    time[0] = +time[0] % 12 || 12; // Adjust hours
  }
  return time.join (''); // return adjusted time or original string
}

tConvert ('18:00:00');

12 hours to 24 hours javascript

const time = '5:00AM';

function convertTo24HrsFormat(time) {
   const slicedTime = time.split(/(PM|AM)/gm)[0];

   let [hours, minutes] = slicedTime.split(':');

   if (hours === '12') {
      hours = '00';
   }

   let updateHourAndMin;

   function addition(hoursOrMin) {
      updateHourAndMin =
         hoursOrMin.length < 2
            ? (hoursOrMin = `${0}${hoursOrMin}`)
            : hoursOrMin;

      return updateHourAndMin;
   }

   if (time.endsWith('PM')) {
      hours = parseInt(hours, 10) + 12;
   }

   return `${addition(hours)}:${addition(minutes)}`;
}

console.log(`Converted time: ${convertTo24HrsFormat(time)}`);