JavaScript Date Methods CheatSheet (Bookmark This)

If you only save one page for JavaScript dates — make it this one.

📚 Official Docs: MDN Docs

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🎯 Quick Mental Model

• Months are 0-based → Jan = 0, Dec = 11
• getDay() = weekday, getDate() = actual date
• Timestamp = milliseconds since Jan 1, 1970 (UTC)
• Date is mutable (set methods change original object)

🔥 Pro Tips

• Always use toISOString() for APIs
• Use Date.now() for performance timestamps
• Be careful with timezones (use UTC methods if needed)