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How to format JavaScript date into yyyy-mm-dd format?
To format a JavaScript date into "yyyy-mm-dd" format, you can use several methods. The most common approaches are using toISOString() with substring extraction or building the format manually.
Using toISOString() Method
The toISOString() method returns a date in ISO 8601 format. To get just the "yyyy-mm-dd" part, extract the first 10 characters:
<html>
<head>
<title>JavaScript Date Formatting</title>
</head>
<body>
<script>
var date = new Date();
var formattedDate = date.toISOString().substring(0, 10);
document.write("Full ISO: " + date.toISOString() + "<br>");
document.write("yyyy-mm-dd: " + formattedDate);
</script>
</body>
</html>
Full ISO: 2024-01-15T08:13:47.648Z yyyy-mm-dd: 2024-01-15
Manual Formatting Method
For more control, you can manually format the date using getFullYear(), getMonth(), and getDate():
<html>
<head>
<title>Manual Date Formatting</title>
</head>
<body>
<script>
var date = new Date();
var year = date.getFullYear();
var month = String(date.getMonth() + 1).padStart(2, '0');
var day = String(date.getDate()).padStart(2, '0');
var formatted = year + '-' + month + '-' + day;
document.write("Manual format: " + formatted);
</script>
</body>
</html>
Manual format: 2024-01-15
Comparison
| Method | Pros | Cons |
|---|---|---|
toISOString().substring(0, 10) |
Simple, concise | Always uses UTC time |
| Manual formatting | Uses local time, more control | Slightly more code |
Key Points
-
toISOString()returns UTC time in ISO format -
getMonth()returns 0-11, so add 1 for correct month -
padStart()ensures two-digit formatting for month and day
Conclusion
Both methods work well for formatting dates as "yyyy-mm-dd". Use toISOString().substring(0, 10) for simplicity, or manual formatting when you need local time instead of UTC.
Updated on: 2026-03-15T23:18:59+05:30
4K+ Views
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