将12小时格式的时间字符串(具有上午/下午)转换为24小时格式的UTC

function convertTimeToUTC(timeString) {
  // 解析时间字符串
  const timeRegex = /(\d{1,2}):(\d{2})\s*(AM|PM)/;
  const match = timeString.match(timeRegex);
  
  if (!match) {
    return "无效的时间格式";
  }
  
  let hour = parseInt(match[1]);
  const minute = match[2];
  const period = match[3].toUpperCase();
  
  // 调整小时
  if (period === "PM" && hour !== 12) {
    hour += 12;
  } else if (period === "AM" && hour === 12) {
    hour = 0;
  }
  
  // 转换为UTC时间
  const utcDate = new Date();
  utcDate.setUTCHours(hour);
  utcDate.setUTCMinutes(minute);
  
  // 格式化为24小时制时间字符串
  const utcTimeString = utcDate.toISOString().substr(11, 5);
  
  return utcTimeString;
}

// 示例用法
const timeString = "10:30 AM";
const utcTime = convertTimeToUTC(timeString);
console.log(utcTime);