How can i compare to dates (string) in Javascript?

Question

I am writing function with condition, which should compare dates and in the end i should get special result for specific date? But it's not work right and i want to understand why? Can you help to me with it?

function yourDates(date){
if (date <= '20.04' && date >= '21.03'){
    zodiak_name = 'Aries';
}
else if (date <= '21.04' && date >= '21.05'){
    zodiak_name = 'Taurus';
}
else if (date <= '22.05' && date >= '21.06'){
    zodiak_name = 'Twins';
}
else if (date <= '22.06' && date >= '22.07'){
    zodiak_name = 'Cancer';
}
else if (date <= '23.07' && date >= '21.08'){
    zodiak_name = 'Lion';
}
else if (date <= '22.08' && date >= '23.09'){
    zodiak_name = 'Virgin';
}
else if (date <= '24.09' && date >= '23.10'){
    zodiak_name = 'Scale';
}
else if (date <= '24.10' && date >= '22.11'){
    zodiak_name = 'Scorpion';
}
else if (date <= '23.11' && date >= '22.12'){
    zodiak_name = 'Archer';
}
else if (date <= '23.12' && date >= '20.01'){
    zodiak_name = 'Capricorn';
}
else if (date <= '21.01' && date >= '19.02'){
    zodiak_name = 'Aquarius';
}
else {
    zodiak_name = 'Fish'
};

return zodiak_name

}

Aziz Hakberdiev · Accepted Answer · 2022-07-27 04:12:31Z

1

Alghoritm for comparing DD.MM dates

Compare months
If months are equal, compare days

In this code you are treating strings like numbers, thus getting errors

But if you write dates in MM.DD format you can numberify and run usual comparement on them

answered Jul 27, 2022 at 4:12

Aziz Hakberdiev

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Comments

Kishan Mevada · Accepted Answer · 2022-07-27 05:06:54Z

1

You can either use a library like moment.js or do something like mentioned :

var dateFrom = "06/06/2022";
var dateTo = "06/10/2022";
var dateToCheck = "06/08/2022";

var d1 = dateFrom.split("/");
var d2 = dateTo.split("/");
var c = dateToCheck.split("/");

var from = new Date(d1[2], parseInt(d1[1])-1, d1[0]);  // -1 because months are from 0 to 11
var to   = new Date(d2[2], parseInt(d2[1])-1, d2[0]);
var check = new Date(c[2], parseInt(c[1])-1, c[0]);

console.log(check > from && check < to)

answered Jul 27, 2022 at 5:06

Kishan Mevada

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Vivek Verma · Accepted Answer · 2022-07-27 05:11:36Z

1

Instead of using hardcoded dates u can use index to find months and for days you can store them in array.

Thought Process

If month is January and the date is less than 20 it means we are still in december month's sign, In second condition we are checking if day is less than given day in days array for same month, which means we are still in previous month's sign Other than that we can just return the sign of current month

function getSign(userDate){
    const days =  [21, 20,21, 21, 22, 22, 23, 24, 24, 24, 23, 22];
    const signs = ["Aquarius", "Fish","Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn"];
    let [day, month]=userDate.split(".").map(item=>parseInt(item));
    // Subtracting one cause index starts from 0
    // January is 0th month
    month--;
    
    if(month == 0 && day <= 20){
      month = 11;
    }else if(day < days[month]){
      month--;
    };
    return signs[month];
}

edited Jul 27, 2022 at 5:11

answered Jul 27, 2022 at 4:58

Vivek Verma

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Vivek Verma Over a year ago

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