Question 161536 in Javascript Question posted in
A very good W3school tutorial can be found here.

How do I get hours from an ISO date string in Javascript?

I have an ISO date which is stored as a string. I want to get only the hours part as is. The below code does not work. So, how do I make it work using dayjs?

function getHours(date:string){
 const hour : dayjs(date).hour();
 console.log(hour);
}

getHours("2023-05-06T08:00:00Z");//Expected 8, but got 1.
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2

Answers


  1. 0

    In dayjs you need to use the utc plugin:

    var dayjs = require("dayjs")
var utc   = require("dayjs/plugin/utc")

dayjs.extend(utc);

function getHours(date){
 const hour = dayjs.utc(date).hour();
 return hour;
}

getHours("2023-05-06T08:00:00Z"); // 8
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  2. 0

    You have a string with a specific format and you want a substring. Using a date library like dayjs or even built-in Date would be overkill. Get the substring and optionally convert it to a number:

    function getHours(date){
  console.log(date.substr(11, 2));
  console.log(+date.substr(11, 2));
}

getHours("2023-05-06T08:00:00Z");

    No plugins, no external libraries and only one conversion from string to number required.

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