How do I insert a string at more than one position in a string?

Question

I have this two strings in Javascript 20130927 this represent a date and 192600 which is a hour. I want to use Moment.js library to parse them as a valid Date/Time element but before I need to convert to valid date javascript object so I need to transform the string in something like 2013-09-27 or 2013/09/27 (I though both are valid) and 19:26:00 . I read about slice() and substr() methods but don't get how to use them to achieve the expected result. Any help?

Answer 1

You can use substring like this:

str = "20130927"
year = str.substring(0,4)
month = str.substring(4,6)
day = str.substring(6,8)

And then create a new Date object with that like this:

new Date(year, month, day)

For the time you would do something similar and pass the results as additional parameters to the Date constructor.

Answer 2

You should be able to use moment's built in parser.

Something along these lines works for me:

var moment = require('moment');
var date = "20130927";
var hour = "192600";
var newDateTime = moment(date+hour, "YYYYMMDDHHmmss");
console.log(newDateTime)

outputs:

{ _i: '20130927192600',
  _f: 'YYYYMMDDHHmmss',
  _l: undefined,
  _isUTC: false,
  _a: [ 2013, 8, 27, 19, 26, 0, 0 ],
  _d: Fri Sep 27 2013 19:26:00 GMT-0400 (EDT) }

See here for additional info.