24小时时间转为12小时制

            function convertTo12Hour(time24h){let [hours, minutes] = time24h.split(':');let modifier = '上午';if (parseInt(hours, 10) > 12) {modifier = '下午';hours = (parseInt(hours, 10) - 12).toString();}if (parseInt(hours, 10) === 12) {modifier = '下午';}if (parseInt(hours, 10) === 0) {//hours = '12';//如果这是是12 调用方法时间为00:00 会转换成12:00上午hours = '00';}return `${hours.padStart(2, '0')}:${minutes} ${modifier}`;//return `${hours.padStart(2, '0')}点${minutes}`;}convertTo12Hour('18:30')//'06:30 下午'convertTo12Hour('00:30')//'00:30 上午'convertTo12Hour('09:00')//'09:30 上午'

12小时时间转为24小时制

function convertTo24Hour(time12h) {const [time, modifier] = time12h.split(' ');let [hours, minutes] = time.split(':');if (hours === '12') {hours = '00';}if (modifier === 'PM') {hours = parseInt(hours, 10) + 12;hours = hours.toString().padStart(2, '0');}return `${hours}:${minutes}`;
}// 示例
console.log(convertTo24Hour('01:30 PM')); // 输出: 13:30
console.log(convertTo24Hour('12:30 AM')); // 输出: 00:30
console.log(convertTo24Hour('11:59 PM')); // 输出: 23:59