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Dates in Java Script are easy to make use of once you understand how they are implemented and once you realize how the Java Script's type juggling gets into the act. The key idea in using a Date object is to know that it stores the date and time as the number of milliseconds from the fixed date: Why this exact date in 1970?
The reason is that this is the Unix epoch, i.e it is around the time when the Unix operating system was created.
Similarly when you get a local time the UTC time is converted to local time.
The rule is that the Date object always stores the UTC time and conversions to and from local time are performed unless you use the UTC methods.
For the beginner, or for the occasional date user, it can be confusing.
These static methods are supported by all modern browsers but not by older versions- IE 8 for example - however, they are easy to add.
The most useful of the static methods is which parses the date in the string and returns the number of milliseconds.
Notice that all of these static functions return simple numeric values and not a date object.
Also notice that earlier versions of Java Script didn't support these static methods.
That is: Java Script time (millisecond ticks) = Unix time*1000 There is also the complication that Java Script doesn't store its times as simple 32-bit integers but as integers represented as 64-bit floating point values.