# Date Object Calculations : Number Data Type « Language Basics « JavaScript DHTML

Date Object Calculations

```
<HTML>
<TITLE>Date Calculation</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function nextWeek() {
var todayInMS = today.getTime()
var nextWeekInMS = todayInMS + (60 * 60 * 24 * 7 * 1000)
return new Date(nextWeekInMS)
}
</SCRIPT>
<BODY>
Today is:
<SCRIPT LANGUAGE="JavaScript">
var today = new Date();
document.write(today);
</SCRIPT>
<BR>
Next week will be:
<SCRIPT LANGUAGE="JavaScript">
document.write(nextWeek());
</SCRIPT>
</BODY>
</HTML>

```

### Related examples in the same category

 1 Define variables, assign values and output 2 Dividing by Zero 3 Add Four Numbers from an HTML Form (and Display the Results) 4 Add characters 5 Complex class to represent complex numbers 6 A Function That Returns the Sum of Three Numbers (Stripped-Down Version) 7 Concatenating Variables and Displaying the Value Contained 8 JavaScript Loan Calculator 9 Factorials 10 Converting a Number to a String 11 Creating Number Objects Rather than Performing String-to-Number Conversions 12 Using toString() with Radix Values 13 Using JavaScript Integers 14 Conversion of Logical Values to Numeric Values 15 Using Floating-Point Numbers 16 Automatic Conversion between Types 17 Explicit Conversion Functions 18 Operator Precedence and Different Data Types 19 Converting Base 10 to Base 16 Using Bitwise Operators 20 Number Calculation 21 Format a number 22 Format a number 2 23 Decimal to 2 Hex 24 Concatenate integer variable to a string variable