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https://www.tutorialspoint.com/How-to-add-2-hours-to-a-JavaScript-Date-object#:~:text=To%20add%20hours%20to%20a%20JavaScript%20Date%20object%2C,following%20code%20to%20add%202%20hours%20to%20date.
https://www.w3schools.com/jsref/jsref_getHours.asp
Get the hour from a specific date and time: const d = new Date ("July 21, 1983 01:15:00"); let hour = d.getHours(); Try it Yourself ».
https://www.w3schools.com/jsref/jsref_sethours.asp
Required. The Hours. 0 to 23, but other values are allowed: -1 gives the last hour of the previous day; 24 gives the first hour of the next day; min: Optional. The Minutes. 0 to 59, but other values are allowed: -1 gives the last minute of the previous hour; 60 gives the first minute of the next hour; sec: Optional. The seconds. 0 to 59, but other values are allowed:
https://stackoverflow.com/questions/70181890/calculating-hours-between-two-dates-and-time-in-javascript
I am getting hours and minutes in all cases apart from case time difference is 1 hours or else. console output: startShiftTime: 02-12-2021 09:00:00 AM endShiftTime: 01-12-2021 09:30:00 PM hours: 11 minutes: 30 startShiftTime: 02-12-2021 04:30:00 PM endShiftTime: 02-12-2021 05:00:00 PM hours: -1 minutes: -30
https://www.codexworld.com/how-to/add-hours-to-javascript-date-object/
Here we’ll provide a short and simple code to add hours to JavaScript Date object. Use the following JavaScript code to add hours to current date. Date. prototype. addHours = function (h){ this. setHours (this. getHours + h); return this; } Provide the hours as a parameter in addHours() function which you want to add to the Date object.
https://stackoverflow.com/questions/1050720/adding-hours-to-javascript-date-object
var milliseconds = 0; //amount of time from current date/time var sec = 0; //(+): future var min = 0; //(-): past var hours = 2; var days = 0; var startDate = new Date(); //start date in local time (we'll use current time as an example) var time = startDate.getTime(); //convert to milliseconds since epoch //add time difference var newTime = time + milliseconds + (1000*sec) + (1000*60*min) + …
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