Google Sheets - Format time in format "2.50 - 3.00"

Code.gs

function processTimeString(time, isPostLunch){
  time = time.trim().replace(".",":") + ":00"

  const timeParts = time.split(":")
  if(parseInt(timeParts[0]) < 12 && isPostLunch) time = `${(parseInt(timeParts[0])+12)}:${timeParts[1]}:${timeParts[2]}`

  if(time.split(":")[0].length == 1) time = "0" + time;
  return time
}
function processTime(time, isStart = true, isPostLunch = false){
    const regex = /(\d{1,2}\.\d{2})[^\d]+(\d{1,2}\.\d{2})/gm;

    const str = time;
    let m, fromTime, toTime;

    while ((m = regex.exec(str)) !== null) {
        if (m.index === regex.lastIndex) {
            regex.lastIndex++;
        }
        m.forEach((match, groupIndex) => {
            if(groupIndex == 1) fromTime = ` ${match}`.slice(1)
            if(groupIndex == 2) toTime = ` ${match}`.slice(1)
        });
    }

    if(isStart)
      return processTimeString(fromTime, isPostLunch)
    
    return processTimeString(toTime, isPostLunch)
}
function W3DEV_STARTTIME(time, date, isPostLunch = false) {
  const startTime = processTime(time, true, isPostLunch)
  return `${date} ${startTime}`
}
function W3DEV_ENDTIME(time, date, isPostLunch = false) {
  const endTime = processTime(time, false, isPostLunch)
  return `${date} ${endTime}`
}