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showing results for - "check if date is valid js"
Fabien
07 Jun 2020
1function isValidDate(dateObject){
2    return new Date(dateObject).toString() !== 'Invalid Date';
3}
source
Julia
23 Oct 2018
1const isValidDate = function(date) {
2    return (new Date(date) !== "Invalid Date") && !isNaN(new Date(date));
3}
source
Selene
02 Jan 2017
1var date_regex = /^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/;
2if (!(date_regex.test(testDate))) {
3    return false;
4}
source
Lucia
06 Nov 2019
1function validatedate(inputText,DateFormat)
2{
3// format dd/mm/yyyy or in any order of (dd or mm or yyyy) you can write dd or mm or yyyy in first or second or third position ... or can be slash"/" or dot"." or dash"-" in the dates formats
4var invalid = "";
5var dt = "";
6var mn = "";
7var yr = "";
8var k;
9var delm = DateFormat.includes("/") ? "/" : ( DateFormat.includes("-") ? "-" : ( DateFormat.includes(".") ? "." : "" ) ) ;
10var f1 = inputText.split(delm);
11var f2 = DateFormat.split(delm);
12for(k=0;k<=2;k++)
13{ 
14 dt = dt + (f2[parseInt(k)]=="dd" ? f1[parseInt(k)] : "");
15 mn = mn + (f2[parseInt(k)]=="mm" ? f1[parseInt(k)] : "");
16 yr = yr + (f2[parseInt(k)]=="yyyy" ? f1[parseInt(k)] : "");
17}
18var mn_days = "0-31-" + (yr % 4 == 0 ? 29 : 28) + "-31-30-31-30-31-31-30-31-30-31";
19var days = mn_days.split("-");
20if( f1.length!=3 || mn.length>2 || dt.length>2 || yr.length!=4 || !(parseInt(mn)>=1 && parseInt(mn)<=12) || !(parseInt(yr)>=parseInt(1900) && parseInt(yr)<=parseInt(2100)) || !(parseInt(dt)>=1 && parseInt(dt)<=parseInt(days[parseInt(mn)])) )
21{
22 invalid = "true";
23}
24alert( ( invalid=="true" ? "Invalid Date" : "Valid Date")  );
25}
Hanae
29 Aug 2018
1function isDate(ExpiryDate) { 
2    var objDate,  // date object initialized from the ExpiryDate string 
3        mSeconds, // ExpiryDate in milliseconds 
4        day,      // day 
5        month,    // month 
6        year;     // year 
7    // date length should be 10 characters (no more no less) 
8    if (ExpiryDate.length !== 10) { 
9        return false; 
10    } 
11    // third and sixth character should be '/' 
12    if (ExpiryDate.substring(2, 3) !== '/' || ExpiryDate.substring(5, 6) !== '/') { 
13        return false; 
14    } 
15    // extract month, day and year from the ExpiryDate (expected format is mm/dd/yyyy) 
16    // subtraction will cast variables to integer implicitly (needed 
17    // for !== comparing) 
18    month = ExpiryDate.substring(0, 2) - 1; // because months in JS start from 0 
19    day = ExpiryDate.substring(3, 5) - 0; 
20    year = ExpiryDate.substring(6, 10) - 0; 
21    // test year range 
22    if (year < 1000 || year > 3000) { 
23        return false; 
24    } 
25    // convert ExpiryDate to milliseconds 
26    mSeconds = (new Date(year, month, day)).getTime(); 
27    // initialize Date() object from calculated milliseconds 
28    objDate = new Date(); 
29    objDate.setTime(mSeconds); 
30    // compare input date and parts from Date() object 
31    // if difference exists then date isn't valid 
32    if (objDate.getFullYear() !== year || 
33        objDate.getMonth() !== month || 
34        objDate.getDate() !== day) { 
35        return false; 
36    } 
37    // otherwise return true 
38    return true; 
39}
40
41function checkDate(){ 
42    // define date string to test 
43    var ExpiryDate = document.getElementById(' ExpiryDate').value; 
44    // check date and print message 
45    if (isDate(ExpiryDate)) { 
46        alert('OK'); 
47    } 
48    else { 
49        alert('Invalid date format!'); 
50    } 
51}
52
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