convertgmtTimewithampm

 function convertToGMT(timeWithAMPM, Timezone) {
    console.log('timeWithAMPM >>>----------------------------->',timeWithAMPM);
    const inputTime = new Date();
    if (!timeWithAMPM || typeof timeWithAMPM !== 'string') {
      return null; 
    }
    const [time, ampm] = timeWithAMPM.split(' ');
    const [hours, minutes] = time.split(':');
  
    if (ampm.toLowerCase() === 'pm') {
      inputTime.setHours(hours + 12);
    } else {
      inputTime.setHours(hours);
    }
    inputTime.setMinutes(minutes);
    const offsetInMinutes = Timezone === 'IST' ? 330 : 0; 
    const gmtTime = new Date(inputTime.getTime() - offsetInMinutes * 60000);
    return gmtTime && gmtTime.toUTCString();
  }