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showing results for - "javascript get age"
Loren
25 Jan 2020
1function getAge(dateString) 
2{
3    var today = new Date();
4    var birthDate = new Date(dateString);
5    var age = today.getFullYear() - birthDate.getFullYear();
6    var m = today.getMonth() - birthDate.getMonth();
7    if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) 
8    {
9        age--;
10    }
11    return age;
12}
source
Alessia
23 Feb 2018
1// To calculate age:
2var year_born = prompt("Please enter your date of birth:", "Type here");
3var d = new Date();
4var n = d.getFullYear();
5function getAge(birthYear){
6	var currentDate = new Date();
7    var currentYear = currentDate.getFullYear();
8    age = currentYear - birthYear;
9    return age;
10}
11calculatedAge = getAge(year_born);
12alert("Hello, " + "you are " + calculatedAge + " years old!");
source
Angela
09 Jun 2016
1function Person(dob) {
2  // [1] new Date(dateString)
3  this.birthday = new Date(dob); // transform birthday in date-object
4  
5  this.calculateAge = function() {
6    // diff = now (in ms) - birthday (in ms)
7    // diff = age in ms
8    const diff = Date.now() - this.birthday.getTime(); 
9    
10    // [2] new Date(value); -> value = ms since 1970
11    // = do as if person was born in 1970
12    // this works cause we are interested in age, not a year
13    const ageDate = new Date(diff); 
14    
15    // check: 1989 = 1970 + 19
16    console.log(ageDate.getUTCFullYear()); // 1989
17    
18    // age = year if person was born in 1970 (= 1989) - 1970 = 19
19    return Math.abs(ageDate.getUTCFullYear() - 1970);
20  };
21}
22var age =new Person('2000-1-1').calculateAge();
23console.log(age); // 19
24
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