root@generate-random:~/times/javascript$ _

Generate Random Times in JavaScript

Complete code tutorial with examples and best practices

PHP

JavaScript

[ Code Example - Quick Summary ]

Language: JavaScript

What: Generate random times in JavaScript using Math.random() and string formatting. Covers 12-hour, 24-hour formats, and time validation.

Try it: Use our interactive Times generator or integrate this code into your JavaScript application.

Generate random times in JavaScript using Math.random() and string formatting. Covers 12-hour, 24-hour formats, and time validation. Looking for other languages? Check our code examples in PHP , Python , Java , C# , C++ , Ruby and Go or use our interactive web generator.

JavaScript Code Example

// Generate random time (24-hour format HH:MM:SS)
function randomTime24() {
    const hour = Math.floor(Math.random() * 24);
    const minute = Math.floor(Math.random() * 60);
    const second = Math.floor(Math.random() * 60);
    return `${hour.toString().padStart(2, "0")}:${minute.toString().padStart(2, "0")}:${second.toString().padStart(2, "0")}`;
}

// Generate random time (12-hour format with AM/PM)
function randomTime12() {
    const hour = Math.floor(Math.random() * 12) + 1;
    const minute = Math.floor(Math.random() * 60);
    const ampm = Math.random() < 0.5 ? "AM" : "PM";
    return `${hour.toString().padStart(2, "0")}:${minute.toString().padStart(2, "0")} ${ampm}`;
}

// Generate random time within business hours (9 AM - 5 PM)
function randomBusinessTime() {
    const hour = Math.floor(Math.random() * 9) + 9; // 9-17
    const minute = Math.floor(Math.random() * 60);
    return `${hour.toString().padStart(2, "0")}:${minute.toString().padStart(2, "0")}`;
}

// Generate random time with seconds
function randomTimeWithSeconds() {
    return `${Math.floor(Math.random() * 24).toString().padStart(2, "0")}:${Math.floor(Math.random() * 60).toString().padStart(2, "0")}:${Math.floor(Math.random() * 60).toString().padStart(2, "0")}`;
}

// Validate time format (HH:MM:SS)
function isValidTime(time) {
    const pattern = /^([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]$/;
    return pattern.test(time);
}

// Generate multiple random times
function generateTimes(count = 10) {
    return Array.from({ length: count }, () => randomTime24());
}

console.log("24-hour:", randomTime24());
console.log("12-hour:", randomTime12());
console.log("Business:", randomBusinessTime());
console.log("Valid:", isValidTime("14:30:45"));
console.log("Batch:", generateTimes(3).join(", "));

[EXPLANATION]

JavaScript uses Math.random() to generate hours (0-23), minutes (0-59), and seconds (0-59). padStart(2, "0") adds leading zeros. Math.floor() converts floats to integers. Template literals provide clean string formatting. Hours range 0-23 for 24-hour or 1-12 for 12-hour with AM/PM. RegExp.test() validates time format. Array.from() enables functional batch generation.

Expected Output

24-hour: 14:23:45
12-hour: 09:15 AM
Business: 11:30
Valid: true
Batch: 08:45:12, 16:20:33, 22:10:05

Common Use Cases

Generate times for React/Vue scheduling components
Create time pickers for frontend calendar applications
Test time validation in web forms
Generate random meeting times for productivity apps
Create time-based test data for Node.js APIs

Important Notes

padStart(2, "0") ensures two-digit format (01, 02, etc.)
Math.random() returns [0, 1), multiply by range for values
Use Intl.DateTimeFormat for locale-specific time formatting
Business hours vary by region and industry
Date object can be used for more complex time operations

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Other Programming Languages

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GO $ view --lang=go

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