getMilliseconds()
ES1+Returns the milliseconds (0-999) in the specified date according to local time.
Syntax
date.getMilliseconds()Return Value
number
A number (0-999) representing the milliseconds
Examples
JavaScript
const date = new Date();
console.log(date.getMilliseconds());Output:
// 123
📌 When to Use
Use getMilliseconds() for high-precision timing displays, animation synchronization, or unique ID generation requiring millisecond components.
⚠️ Common Mistakes
Using getMilliseconds() for timing measurements - use Date.now() or performance.now() instead.
✅ Best Practices
For logging timestamps, use toISOString() which includes milliseconds automatically.
⚡ Performance Notes
getMilliseconds() is O(1). For sub-millisecond precision, use performance.now() instead.
🌍 Real World Example
Unique Transaction ID Generator
Generate unique transaction IDs using timestamp with millisecond precision.
function generateTransactionId(prefix = 'TXN') {
const now = new Date();
const timestamp = now.getFullYear().toString() +
String(now.getMonth() + 1).padStart(2, '0') +
String(now.getDate()).padStart(2, '0') +
String(now.getHours()).padStart(2, '0') +
String(now.getMinutes()).padStart(2, '0') +
String(now.getSeconds()).padStart(2, '0') +
String(now.getMilliseconds()).padStart(3, '0');
const random = Math.random().toString(36).substr(2, 4).toUpperCase();
return `${prefix}-${timestamp}-${random}`;
}
console.log(generateTransactionId()); // "TXN-20240315143025123-X7K2"