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Json utc time to local time

I discovered that this URL api-sunrise-sun sunset gives date time in UTC format however I want to convert on the fly to local time irrespective where my webpage is opened ! How would I achieve that?

I suppose you are showing the time after successfully getting the json. Try this:
//today's date, or whatever
var t_date = new Date().toLocaleDateString();
//time from json. example: 10:04:34 PM
var t_from_json = response["results"]["sunrise"]
var utc_date = new Date( t_date + " " + t_from_json + " UTC")
//Date 2017-02-21T22:04:34.000Z
//two options:
utc_date.toString();
//"Tue Feb 21 2017 19:04:34 GMT-0300 (CLST)"
var offset = new Date().getTimezoneOffset();
utc_date.setMinutes(utc_date.getMinutes() - offset);
//Date 2017-02-21T19:04:34.000Z

Convert HH:MM input value to javascript valid date

I have an input value of a time specifically formatted HH:MM is there way I can convert it to a javascript valid date for example:
Time is: 10:20
Valid javascript time would be: Mon Aug 15 2016 10:20:00

var timeString = "10:20:51";
var timeStringArray = timeString.split(':');
var hours = timeStringArray[0];
var minutes = timeStringArray[1];
var seconds = timeStringArray[2];
var now = new Date();
now.setHours(hours);
now.setMinutes(minutes);
now.setSeconds(seconds);
console.log(now);
This just changes the hours/minutes component of the current time though

See if date selected is future from today - JavaScript

I have to compare the date that they want to put in and the current date today, and if they have put in a date that is in the future, then alert them to change the date, otherwise insert the data.
Basically I am having issues comparing the dates. here is my code:
var today = year + '-' + month + '-' + day + ' 00:00:00';
var d1 = new Date(postdate); // postdate = 2014/02/01 ie: 1 Feb 2014
var d2 = new Date(today); // todays date
if(d1>d2){
alert('You cannot post in the future!');
}
But that doesnt seem to work. Where am I going wrong?

Convert the dates into a comparable number, like milliseconds.
if(d1.valueOf()>d2.valueOf()){
alert('You cannot post in the future!');
}

You don't need to create a new variable today.
If by today you are trying to get today's date, you can simply do
var today = new Date();
var d1 = new Date(postdate); // postdate = 2014/02/01 ie: 1 Feb 2014
//----------
var d2 = new Date(year,month,day); // todays date
//----------
if(d1>d2){
alert('You cannot post in the future!');
}
Remember month is 0 based index. So, for december it would be 11.

Compare the dates with the same format, if today is 2014-01-24 00:00:00 then postdate also should be 2014-02-01 00:00:00
Then use + prefix to compare milliseconds:
if(+d1 > +d2){
alert('You cannot post in the future!');
}

How can I add a day to user's input? [duplicate]

This question already has answers here:
How to add days to Date?
(56 answers)
Closed 9 years ago.
I have a textfield that inputs date in this format: yyyy-mm-dd, how can I add a day to that users input? I have the following code but it doesnt work...
users_date = document.getElementById('users_date').value;
var date = new Date(users_date);
var next_date = new Date();
next_date .setDate(date.getDate()+1);
document.getElementById('next_date').value = next_date;
The first problem is the format of the date in the second is like 'Mon Aug 05 2013 16:24:40 GMT-0500 (Hora est. Pacífico, Sudamérica)'
The second problem is that when the user input the fist day of the month like '2013-01-01' or '2013-08-01' it displays 'Sun Sep 01 2013 16:26:06 GMT-0500 (Hora est. Pacífico, Sudamérica)' ALWAYS
For example if user inputs 2013-01-01 I want another textfield to be 2013-01-02 or 2013-08-31 it displays 2013-09-01, how can I do that?
Thanks!!
ITS NOT DUPLICATE BECAUSE THE OTHER POST DOESN'T FORMAT THE DATE!!!!

Prior to ES5 there was no standard for parsing dates. Now there is a format that is a version of ISO8601, however it isn't supported by all browsers in use and is not typically used for user input.
Normally a format is requested or a "date picker" used that returns a specific format. From there, it's quite simple to parse the string to create a Date object:
// s is date string in d/m/y format
function stringToDate(s) {
var b = s.split(/\D/);
return new Date(b[2], --b[1], b[0]);
}
For ISO8601 format (y-m-d), just change the order of the parts:
// s is date string in y/m/d format
function isoStringToDate(s) {
var b = s.split(/\D/);
return new Date(b[0], --b[1], b[2]);
}
To add one day to a Date object, just add one day:
var now = new Date();
var tomorrow = now.setDate(now.getDate() + 1);

This should work:
var date = new Date(document.getElementById('users_date').value);
var next_date = new Date(date.getTime() + 24*60*60*1000); // adding a day
document.getElementById('next_date').value = next_date.getFullYear() + "-" +
(next_date.getMonth()++) + "-" + next_date.getDate();
Please, note that Date#getMonth() is zero-based. Hence, the increment.

convert custom date string to date object

How can I convert a string representation of a date to a real javascript date object?
the date has the following format
E MMM dd HH:mm:ss Z yyyy
e.g.
Sat Jun 30 00:00:00 CEST 2012
Thanks in advance
EDIT:
My working solution is based on the accepted answer. To get it work in IE8, you have to replace the month part (e.g. Jun) with the months number (e.g. 5 for June, because January is 0)

Your date string can mostly be parsed as is but CEST isn't a valid time zone in ISO 8601, so you'll have to manually replace it with +0200.
A simple solution thus might be :
var str = "Sat Jun 30 00:00:00 CEST 2012";
str = str.replace(/CEST/, '+0200');
var date = new Date(str);
If you want to support other time zones defined by their names, you'll have to find their possible values and the relevant offset. You can register them in a map :
var replacements = {
"ACDT": "+1030",
"CEST": "+0200",
...
};
for (var key in replacements) str = str.replace(key, replacements[key]);
var date = new Date(str);
This might be a good list of time zone abbreviation.

You can use following code to convert string into datetime:
var sDate = "01/09/2013 01:10:59";
var dateArray = sDate.split('/');
var day = dateArray[1];
// Attention! JavaScript consider months in the range 0 - 11
var month = dateArray[0] - 1;
var year = dateArray[2].split(' ')[0];
var hour = (dateArray[2].split(' ')[1]).split(':')[0];
var minute = (dateArray[2].split(' ')[1]).split(':')[1];
var objDt = new Date(year, month, day, hour, minute);
alert(objDt);