JavaScript: Find whether or not the date is in daylights savings time
JavaScript Datetime: Exercise-38 with Solution
Write a JavaScript function to find out whether or not the date is daylight savings time.
Test Data :
dt = new Date();
console.log(daylights_savings(dt));
1
Sample Solution:-
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to find whether or not the date is in daylights savings time.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function daylights_savings(dt)
{
var dst = null;
for (var i = 0; i < 12; ++i)
{
var d = new Date(dt.getFullYear(), i, 1);
var offset = dt.getTimezoneOffset();
if (dst === null)
dst = offset;
else if (offset < dst)
{
dst = offset;
break;
}
else if (offset > dst)
break;
}
return (dt.getTimezoneOffset() == dst) | 0;
}
dt = new Date();
console.log(daylights_savings(dt));
dt = new Date(1989, 10, 1);
console.log(daylights_savings(dt));
Sample Output:
1 1
Flowchart:

Live Demo:
See the Pen JavaScript - Find whether or not the date is in daylights savings time-date-ex-38 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript function to get Timezone.
Next: Write a JavaScript function to get difference to Greenwich time (GMT) in hours.
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