hackerrank_time-conversion.js

function processData(input) {
    
    var is_pm = input.indexOf('PM') != -1;
    var s = input.replace('PM', '').replace('AM', '').split(':');
    
    if (is_pm && s[0] != '12')  s[0] = parseInt(s[0]) + 12;
    if (!is_pm && s[0] == '12') s[0] = '00';
    
    process.stdout.write(s[0] + ':' + s[1] + ':' + s[2]);
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});