Develop Reference

javascript getHours() is not a function

I want to add a minute offset to the current time and display it in 12 hour format
var now = new Date();
var offset = 1000;
var timeOffset = now.setMinutes(now.getMinutes() + offset);
var hours = timeOffset.getHours();
var minutes = timeOffset.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
var newTime = hours + ':' + minutes + ' ' + ampm;
console.log(newTime)
why is this throwing TypeError: dateTime.getHours is not a function?

setMinutes set the minutes on the current date-object so take now for further calculations.
var now = new Date();
var offset = 1000;
now.setMinutes(now.getMinutes() + offset);
var hours = now.getHours();
var minutes = now.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
var newTime = hours + ':' + minutes + ' ' + ampm;
console.log(newTime)

The following line does not work as you intened;
var timeOffset = now.setMinutes(now.getMinutes() + offset);
timeOffset will be an integer with a number of miliseconds. Instead off defining a second var, you can alter the now variable like so;
var now = new Date();
var offset = 1000;
now.setMinutes(now.getMinutes() + offset);
var hours = now.getHours();
var minutes = now.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
var newTime = hours + ':' + minutes + ' ' + ampm;
console.log(newTime)

How to set am/pm in javascript

I am using new Date() to create a customize time, and also I'm using a function to format time in am/pm:
const formatTimeAMPM = (date, midnight = { am: "AM", pm: "PM" }) => {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? ` ${midnight.am}` : ` ${midnight.pm}`;
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? "0" + minutes : minutes;
hours = hours < 10 ? "0" + hours : hours;
var strTime = hours + ":" + minutes + " " + ampm;
return strTime;
};
let startDate = new Date(Date.now());
console.log('before change :',formatTimeAMPM(startDate));
startDate.setHours(8, 30, 0, 0);
console.log('after change :',formatTimeAMPM(startDate));
If you run the snippet, you will see console logs the 8:30 pm , Can anyone tell me how to set am for it when I change hour the startDate ?

Your am/pm check is backwards:
var ampm = hours >= 12 ? ` ${midnight.am}` : ` ${midnight.pm}`;
If the hour is >= 12, it should be PM not AM, so it should be:
var ampm = hours >= 12 ? ` ${midnight.pm}` : ` ${midnight.am}`;
Now if you run it, it will show 8:30 AM and if you set the hour to 20 it will show 8:30 PM
This will fix your current issue but it would be better to use an existing library for date formatting since it can get complicated, especially with i18n. There a couple popular ones such as date-fns and moment.js that will do the heavy lifting for you.

Page last modified using Javascript with 12 hour clock showing am or pm

I'm trying to create a script in Javascript that shows when a page was last modified, which returns the date, time, in am or pm format, of modification.
Clearly I am doing something wrong. I can't get the script to run, and it will be in my function AmPm. Can someone please help?
// Javascript code for page modification
// Shows the date, time, am or pm, of modification.
// This section sets the date of modification
function lastModified() {
var modiDate = new Date(document.lastModified);
var showAs = modiDate.getDate() + "." + (modiDate.getMonth() + 1) + "." + modiDate.getFullYear();
return showAs
}
// This section sets the time of modification
function GetTime() {
var modiDate = new Date();
var Seconds
if (modiDate.getSeconds() < 10) {
Seconds = "0" + modiDate.getSeconds();
} else {
Seconds = modiDate.getSeconds();
}
// This section writes the above in the document
var modiDate = new Date();
var CurTime = modiDate.getHours() + ":" + modiDate.getMinutes() + ":" + Seconds
return CurTime
}
// This section decides if its am or pm
function AmPm() {
var hours = new Date().getHours();
var hours = (hours + 24 - 2) % 24;
var mid = 'AM';
if (hours == 0) { // At 00 hours (midnight) we need to display 12 am
hours = 12;
} else if (hours > 12) // At 12pm (Midday) we need to display 12 pm
{
hours = hours % 12;
mid = 'PM';
}
}
var mid = //This is where I am stuck!!
return AmPm
document.write("This webpage was last edited on: ");
document.write(lastModified() + " at " + GetTime() + AmPm());
document.write("");
document.write(" NZ Daylight Savings Time.");
document.write("");

function formatAMPM(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
var strTime = hours + ':' + minutes + ' ' + ampm;
return strTime;
}

How to show current date with time AM PM and CST using jquery

Im trying to show current Date with below format
7/28/2016 11:55:37 PM CST

Date is object of Javascript, Jquery also uses object of javaScript. I hope below code will be usefull for your.
function formatDate(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
var strTime = hours + ':' + minutes + ' ' + ampm;
return date.getMonth()+1 + "/" + date.getDate() + "/" + date.getFullYear() + " " + strTime;
}
var d = new Date();
var e = formatDate(d);
alert(e);

Date formating gives different results in Chrome than in other browsers?

I want to show the time in a readable format. So I am using the below js code. But the output is different in Chrome and IE. How do I change the code to give the same output across all the browsers ?
The output in IE : 12:46 am
In Chrome : 6:16 am
Time zone is : UTC +05:30
var unReadableDate = "2016-01-25T00:46:00";
var newDate = new Date(unReadableDate);
//var timeZoneOffset = (new Date()).getTimezoneOffset();
//newDate.setMinutes(newDate.getMinutes() - timeZoneOffset);
alert(formatAMPM(newDate));
//below function formats time in am and pm
function formatAMPM(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0' + minutes : minutes;
var strTime = hours + ':' + minutes + ' ' + ampm;
return strTime;
}

Can you please try replacing this
var unReadableDate = "2012-06-25T00:46:00.000Z"
var newDate = new Date(unReadableDate);
//var timeZoneOffset = (new Date()).getTimezoneOffset();
//newDate.setMinutes(newDate.getMinutes() - timeZoneOffset);
alert(formatAMPM(newDate));
//below function formats time in am and pm
function formatAMPM(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0' + minutes : minutes;
var strTime = hours + ':' + minutes + ' ' + ampm;
return strTime;
}

Converting a UTC format string to a date using Javascript Date constructor is not reliable. If you want to tackle timezone issues with date you should use moment.js. To understand more you can use below link.
Javascript Date issue
OR simple way to resolve the issue is pass individual arguments in the date instead of complete string. To understand more you can use below link
DateTime UTC

Your problem is that your date string being treated as a local time vs it being treated as UTC.
Just make it unambiguous by specifying the time zone. Change
var unReadableDate = "2016-01-25T00:46:00";
to
var unReadableDate = "2016-01-25T00:46:00Z";