1. © Copyright 2016, Fred McClurg All Rights Reserved
Dates
8/27/2018
Dates
“Bad dates.”
‒ Sallah (John Rhys-Davies), Raiders of the Lost Ark (1981)
© Copyright 2016, Fred McClurg All Rights Reserved
Introduction to JavaScript

2. Setting Today’s Date What is a Date? Dates in JavaScript are objects.
Example:
// set to current date/time
var today = new Date();
console.log( today );
dateSetToday.html

3. Setting Date via Arguments
How do I set a specific date?
A date can be set via multiple arguments.
Examples:
var year = 1941;
var month = ; // 0=january
var day = 7;
var hour = 7;
var minute = 48;
// set to December 7, :48 am
var pearlHarbor = new Date( year, month, day,
hour, minute );
console.log( pearlHarbor );
dateSetArgs.html

4. Setting Date via String
Dates
8/27/2018
Setting Date via String
Can I set a date with a string?
Dates can also be set via a string.
Examples:
var dateStr = "December 7, :48";
var pearlHarbor = new Date( dateStr );
console.log( pearlHarbor );
dateSetStr.html
Introduction to JavaScript

5. Getting Date Values What is a Date?
The date object has a number of methods for retrieving values.
Examples:
// set to current date/time
var today = new Date();
console.log( today );
today.getFullYear(); // YYYY
today.getMonth(); // =january
today.getDate(); // 1-31 day of month
today.getDay(); // 0-6 dow 0=sun
today.getHours(); // 0-23
today.getTime(); // ms since 1/1/1970
dateMethods.html

6. Day of Week Calculator
var dobStr = prompt( "Enter birthdate: (no dashes)",
"December 7, 1941" ); // default
// convert string to date object
var dobObj = new Date( dobStr );
// calculate day of week
var dowNum = dobObj.getDay(); // 0-6 day of week 0=Sun
// create day of week array
var dowStr = [ "Sun", "Mon", "Tue", "Wed",
"Thu", "Fri", "Sat" ];
// create message
var msg = "Born on: " + dowStr[ dowNum ];
alert( msg );
dateDowPrompt.html