标准JavaScript中的日期格式

Question

I have a date in "Mar 15, 2017 5:06:16 PM" format and i have to convert it into browser's timezone which i am doing using "Date" in javascript but the final time i am getting is in "3/15/2017, 5:06:16 PM" format i have to change it to "Mar 15, 2017 5:06:16 PM"

How this can be achieved using JavaScript?

I have tried JavaScript inbuilt functions like

(1) toISOString

(2) toLocalString

(3) toUTCString

but no luck, i feel like there is no standard js method. can anyone provide me that piece of code which can change it into the desired format ?

Answer 1

You don't have to use different methods, you can simply use string manipulation, if you want a custom date string display and don't want to load any additional libraries such as momentjs:

var months = [ 'Jan', ... ];
var parts = Date.toString() // 3/15/2017, 5:06:16 PM
            .split('/');    // [ "3", "15", "2017, 5:06:16 PM" ]

console.log( months[ parts[ 0 ] ] + " " + parts[ 1 ] + ", " + parts[ 2 ] );

This is definitely not the only solution, but whenever you want to change the display format of anything, you can always remind yourself that you can use string manipulation. A more semantically correct way to do it would be not to do any string manipulation, but by placing Date.getMonth in the wanted part of a string, for example.

If you're using ES6, you can make it very pretty:

console.log( `${monthString} ${dayNum}, ${yearNum} ${hourNum % 12}:${leftPad(minuteNum,2)}:${leftPad(secondNum,2)} ${hourNum < 12 ? 'PM' : 'AM'} ` );