TimeConversion in 24 hour format

Given a time in -hour AM/PM format, convert it to military (24-hour) time.

Note: - 12:00:00AM on a 12-hour clock is 00:00:00 on a 24-hour clock.

- 12:00:00PM on a 12-hour clock is 12:00:00 on a 24-hour clock.

function  convertionTime(time) {

  const PMTime =   time.toString().search("PM")

   const AmTime =   time.toString().search("AM")

   let timeString =  time.split(":")

  if(PMTime !== -1) {

    if(Number(timeString[0]) < 12){

    timeString[0] = Number(timeString[0]) + 12

    }

  }else if(AmTime !== -1){

    if(Number(timeString[0]) == 12){

    timeString[0] = "00"

    }

  }

  const joinedString = timeString.join(":").slice(0, 8)

 return joinedString

}

const HourFormat =  convertionTime("01:05:45PM")

console.log(HourFormat)