The date object is very useful for obtaining the date and time on the client. It supports various methods, which return a specific value.
To start working with dates and time, we first initialize a variable and assign it a value with the new operator and the Date() constructor. The main function of the new operator with Date() constructor is to create a new date object that is stored in the variable. Here is the code:
var d = new Date();
Thus, variable d contains a new date object. We can now call the various methods of this date object.
var t_date = d.getDate(); // Returns the day of the month var t_mon = d.getMonth(); // Returns the month as a digit var t_year = d.getFullYear(); // Returns 4 digit year var t_hour = d.getHours(); // Returns hours var t_min = d.getMinutes(); // Returns minutes var t_sec = d.getSeconds(); // Returns seconds var t_mil = d.getMilliseconds(); // Returns Milliseconds
Now we can easily display the date, month and year in an alert box, using the values stored in respective variables.
alert("Today's date is " + t_date + "-" + t_mon + "-" + t_year);
The eagle-eyed would have noticed that the month digit is one less than the present month. Hence, if you want to display the month, increment the value returned by getMonth() by 1. The corrected code should be:
t_mon++; alert("Today's date is " + t_date + "-" + t_mon + "-" + t_year);
Similarly, we can get the time using the variables that store hours, minutes, seconds and milliseconds values.
alert("The time is " + t_hour + ":" + t_min + ":" + t_sec);
In the next session we’ll see how we can display a greeting based on the client time.
The first program to incorporate WYSIWYG technology was Bravo. This document preparation program was developed for the Alto computer designed at the Palo Alto Research Center of Xerox. Though Bravo was never released commercially, its direct descendant was included in the Xerox Star. WYSIWYG, Ethernet, GUI, bitmap graphics and several computer technologies that we used today have been developed at the Xerox's Palo Alto Research Center (PARC). [more...]