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🧠 1. Introduction to Date Object

The Date Object in JavaScript is used to work with dates and time.

👉 It allows you to:

• Get current date and time
• Set custom dates
• Perform date calculations

✅ Creating a Date Object:

let today = new Date();
console.log(today);

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🔍 2. Ways to Create Date Object

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(1) Current Date & Time

let d = new Date();

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(2) Specific Date (String Format)

let d = new Date("2025-01-01");

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(3) Using Parameters

let d = new Date(year, month, day, hours, minutes, seconds);

👉 Example:

let d = new Date(2025, 0, 1); // January (month starts from 0)

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(4) Using Milliseconds

let d = new Date(0); // Jan 1, 1970

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⚠️ Important Note

👉 Months are 0-based (0 = January, 11 = December)

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📅 3. Getting Date Values (Getter Methods)

Method	Description
getFullYear()	Year
getMonth()	Month (0–11)
getDate()	Day of month
getDay()	Day of week (0–6)
getHours()	Hours
getMinutes()	Minutes
getSeconds()	Seconds
getMilliseconds()	Milliseconds
getTime()	Milliseconds since 1970

💻 Example:

let d = new Date();

console.log(d.getFullYear());
console.log(d.getMonth());
console.log(d.getDate());
console.log(d.getHours());

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✏️ 4. Setting Date Values (Setter Methods)

Method	Description
setFullYear()	Set year
setMonth()	Set month
setDate()	Set day
setHours()	Set hours

💻 Example:

let d = new Date();

d.setFullYear(2030);
d.setMonth(5);
d.setDate(15);

console.log(d);

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⏱️ 5. Date Formats

(a) ISO Format

let d = new Date("2025-05-01");

(b) Short Format

let d = new Date("05/01/2025");

(c) Full Format

let d = new Date("May 1, 2025");

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🔄 6. Converting Date to String

Method	Output
toDateString()	Date only
toTimeString()	Time only
toISOString()	Standard format
toLocaleDateString()	Local date

💻 Example:

let d = new Date();

console.log(d.toDateString());
console.log(d.toTimeString());

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🔢 7. Date Calculations

Example: Difference between two dates

let d1 = new Date("2025-01-01");
let d2 = new Date("2025-01-10");

let diff = d2 - d1;
console.log(diff / (1000 * 60 * 60 * 24)); // days

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⏰ 8. Working with Time

Current Time:

let d = new Date();
console.log(d.getHours() + ":" + d.getMinutes());

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🔄 9. Complete Example

let now = new Date();

console.log("Year:", now.getFullYear());
console.log("Month:", now.getMonth());
console.log("Date:", now.getDate());
console.log("Day:", now.getDay());
console.log("Time:", now.getHours() + ":" + now.getMinutes());

now.setFullYear(2030);
console.log("Updated Year:", now.getFullYear());

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🔄 Summary Table

Feature	Use
new Date()	Current date
get methods	Read values
set methods	Modify values
toString methods	Format output
calculations	Date difference

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⚠️ Important Points

• Month starts from 0
• Date object stores time in milliseconds
• Useful for:
  • Timers
  • Scheduling
  • Event tracking

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🎯 Conclusion

The Date Object is essential for:

• Handling date and time operations
• Performing calculations
• Creating dynamic applications

👉 It is widely used in real-time systems, booking apps, and scheduling systems.

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