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What is the best way to initialize a JavaScript Date to midnight?
To initialize a JavaScript Date to midnight, you need to set the time components (hours, minutes, seconds, and milliseconds) to zero using the setHours() method.
Syntax
date.setHours(hours, minutes, seconds, milliseconds)
For midnight, use:
date.setHours(0, 0, 0, 0)
Example: Setting Current Date to Midnight
<!DOCTYPE html>
<html>
<body>
<script>
var dt = new Date();
console.log("Original date:", dt.toString());
dt.setHours(0, 0, 0, 0);
console.log("Midnight date:", dt.toString());
document.write("<p>Original: " + new Date() + "</p>");
document.write("<p>Midnight: " + dt + "</p>");
</script>
</body>
</html>
Mon May 28 2018 00:00:00 GMT+0530 (India Standard Time)
Creating a New Date at Midnight
You can also create a new Date object and immediately set it to midnight:
<!DOCTYPE html>
<html>
<body>
<script>
// Method 1: Chain the methods
var midnightDate = new Date().setHours(0, 0, 0, 0);
// Method 2: Create and then set
var today = new Date();
today.setHours(0, 0, 0, 0);
document.write("<p>Today at midnight: " + today + "</p>");
</script>
</body>
</html>
Parameters
| Parameter | Value for Midnight | Description |
|---|---|---|
| hours | 0 | Hour (0-23) |
| minutes | 0 | Minutes (0-59) |
| seconds | 0 | Seconds (0-59) |
| milliseconds | 0 | Milliseconds (0-999) |
Common Use Cases
Setting dates to midnight is useful for:
- Date comparisons (comparing only dates, not times)
- Creating date ranges that start from the beginning of a day
- Database queries that need exact date matching
- Calendar applications
Conclusion
Use setHours(0, 0, 0, 0) to set any JavaScript Date object to midnight. This method modifies the existing date and ensures all time components are reset to zero.
Updated on: 2026-03-15T23:18:59+05:30
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