CODEWITHSUNDEEP
javascriptangularjsdate
Jefferson Bruchado
Jefferson Bruchado

Reputation: 908

How to compare date string using javascript

I have the following string value of a date, Sun Apr 07 2019 00:00:00 GMT-0300, and I need to compare with the following date format 2019-04-08T03:00:00.000Z, note that both are the same day, I need to compare them and return a true as being equal days,

but I do not know how to do this using javascript, any help?

I tried to do something like this but it does not return me true:

if (input) { 

     //input.value = "Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)"

     var situation = angular.isArray(item.situation) ? item.situation : [item.situation]; 

     // situation = 
     //[
     //    0: "2019-04-08T03:00:00.000Z"
     //    1: "2019-04-13T03:00:00.000Z"
     //]

     if (!angular.isArray(input.value)) {
        condition = situation.indexOf(input.value) >= 0;

     } else if (angular.isArray(input.value)) {
        condition = $window._.intersection(situation, input.value).length > 0;
     }
}

if (condition) {
    break;
}

//input.value = "Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)"

 situation = 
     [
         0: "2019-04-08T03:00:00.000Z"
         1: "2019-04-13T03:00:00.000Z"
     ]

Upvotes: 1

Views: 466

Answers (3)

Styx
Styx

Reputation: 10076

Sun Apr 07 2019 00:00:00 GMT-0300

2019-04-08T03:00:00.000Z

note that both are the same day

No, they are not.

You can convert them both to ISO string and just compare their date parts as strings (if I understood the question correctly, you want to compare date only, without time):

function isSameDate(date1, date2) {
  const [d1, ] = (new Date(date1)).toISOString().split('T');
  const [d2, ] = (new Date(date2)).toISOString().split('T');
  return d1 === d2;
}

Upvotes: 3

Davi
Davi

Reputation: 4147

Convert all the values to Date objects and compare those. Use a framework/library to do it, because parsing strings to dates manually has lots of places where it can go wrong.

Currently you are comparing the literal Strings. Because neither "2019-04-08T03:00:00.000Z", nor "2019-04-13T03:00:00.000Z" match "Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)", your second if statement fails.

Upvotes: 0

Nino Filiu
Nino Filiu

Reputation: 18493

Build a date from the strings and compare the days (ie number of seconds since epoch / number of seconds in a day):

const sameDay = (dateString1, dateString2) => {
  let time1 = (new Date(dateString1)).getTime();
  let time2 = (new Date(dateString2)).getTime();
  return Math.floor(Math.abs((time1-time2))/(1000*60*60*24))==0;
}

console.log(
  sameDay('Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)','2019-04-08T03:00:00.000Z'),
  sameDay('Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)','2019-04-13T03:00:00.000Z'),
);

Upvotes: -1

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