Javascript:将包含日期和时间的字符串转换为UTC时区中的字符串

var dateString = '2022-12-31T23:59:59';

var date = new Date(dateString);

var year = date.getUTCFullYear();
var month = date.getUTCMonth() + 1; // 注意月份从0开始，需要加1
var day = date.getUTCDate();
var hour = date.getUTCHours();
var minute = date.getUTCMinutes();
var second = date.getUTCSeconds();

var utcString = year + '-' + padNumber(month) + '-' + padNumber(day) + 'T' + padNumber(hour) + ':' + padNumber(minute) + ':' + padNumber(second) + 'Z';

function padNumber(num) {
  return num.toString().padStart(2, '0');
}

console.log(utcString);

var dateString = '2022-12-31T23:59:59';
var date = new Date(dateString);

var year = date.getUTCFullYear();
var month = date.getUTCMonth() + 1;
var day = date.getUTCDate();
var hour = date.getUTCHours();
var minute = date.getUTCMinutes();
var second = date.getUTCSeconds();

var utcString = year + '-' + padNumber(month) + '-' + padNumber(day) + 'T' + padNumber(hour) + ':' + padNumber(minute) + ':' + padNumber(second) + 'Z';

console.log(utcString);

function padNumber(num) {
  return num.toString().padStart(2, '0');
}