Match Date from a string and convert UTC to Local

Question

I have following message on Login Failed response. The response shows Date in UTC format. I wanted to get the date and convert from UTC to Local. I tried the following but I'm still having the same date formate. Can anyone help me what I'm doing wrong here

var loginRes = 'Too many incorrect attempts. Account is locked until: 2018-03-16T05:13:58+00:00'


var dateRegx = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}-\d{2}:\d{2}/;
var ErrorMessage = (loginRes).replace(dateRegx, 
  function(match){
       return moment(match).format("MMMM Do YYYY, h:mm:ss a");
});
console.log(ErrorMessage);

On my console print, I'm having same as LoginRes. I was expecting something like :

Too many incorrect attempts. Account is locked until: March 16th 2018, 8:13:14 pm

Answer 1

Your regex doesn't match the date

var loginRes = 'Too many incorrect attempts. Account is locked until: 2018-03-16T05:13:58+00:00'


    var dateRegx = /(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d+([+-][0-2]\d:[0-5]\d|Z))|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d([+-][0-2]\d:[0-5]\d|Z))|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d([+-][0-2]\d:[0-5]\d|Z))/;
    var ErrorMessage = (loginRes).replace(dateRegx, 
      function(match){
      console.log('tst')
           return moment(match).format("MMMM Do YYYY, h:mm:ss a");
    });
    console.log(ErrorMessage);

Answer 2

You can also solve this using lastIndexOf() :

 var loginRes = 'Too many incorrect attempts. Account is locked until: 2018-03-16T05:13:58+00:00'; var idx = loginRes.lastIndexOf(' '); var ErrorMessage = loginRes.substring(0, idx) + ' ' + moment(loginRes.substring(idx)).format("MMMM Do YYYY, h:mm:ss a"); console.log(ErrorMessage); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.21.0/moment.min.js"></script> 

Answer 3

Your regex is incorrect, it does not match the + before offset, you can use /\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\+\\d{2}:\\d{2}/ instead.

Moreover you can use moment.utc to parse your input as UTC and local() to convert it in local mode.

 var loginRes = 'Too many incorrect attempts. Account is locked until: 2018-03-16T05:13:58+00:00' var dateRegx = /\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\+\\d{2}:\\d{2}/; var ErrorMessage = (loginRes).replace(dateRegx, function(match){ return moment.utc(match).local().format("MMMM Do YYYY, h:mm:ss a"); }); console.log(ErrorMessage); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>