Use the date-fns max function to identify the latest date in an array of date strings

The Dates string array is created using data from the backend object in the following manner:

const dates: string[] = this.data.map((item:any) => item.date.jsdate);

Here is the resulting array:

dates = [
    Thu Jan 12 2015 00:00:00 GMT+0530 (India Time), 
    Tue Feb 25 2015 00:00:00 GMT+0530 (India Time), 
    Sun Jan 28 2016 00:00:00 GMT+0530 (India Time)
]

The type of dates is "object"

What is the best way to find the latest date in the jsdates array?

Can the max function from date-fns library be used for this purpose?

javascriptarraysangulartypescriptdate-fns

Answer №1

Transform each date into a Date object and compare them using the getTime() function.

var dates = [
    'Thu Jan 12 2015 00:00:00 GMT+0530 (India Time)', 
    'Tue Feb 25 2015 00:00:00 GMT+0530 (India Time)', 
    'Sun Jan 28 2016 00:00:00 GMT+0530 (India Time)'
]

console.log(
  dates.sort((a,b)=>new Date(b).getTime() - new Date(a).getTime())[0]
)

Answer №2

If you're looking for a solution, one approach is to leverage the capabilities of the momentjs (https://momentjs.com/) library.

To sort the dates, you can use the following code:

dates = dates.sort((a,b) => moment(a).diff(moment(b));

Then, to find the latest date, simply retrieve the last element from the sorted array:

return dates[dates.length-1];

Alternatively, you can achieve the same result without momentjs:

dates = dates.sort((a,b) => new Date(b) - new Date(a));

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