Digital type processing and convenient method of ext JS

JavaScript Of Date type

Creation of time object

How to create date objects ：

myDate = new Date();
myDate = new Date("December 19, 1983 03:24:00");
myDate = new Date(1983,11,19);
myDate = new Date(1983,11,17,3,24,0);

• Without parameters, you create a current date
• You can use the local time substring as a parameter ; You can also pass in year, month, and day as parameters ; You can also import the date , Hours, minutes and seconds as parameters .

Date

• Time can be converted into a number in milliseconds , The conversion is based on international standard time （UTC） Of 1970 year 1 month 1 Midnight on the th is the starting point . The number of milliseconds in a day is 246060*1000 = 86,400,000.
• Date Type of date has a time range , With 1970 year 1 month 1 Day as the center point , Forward and backward 100,000,000 God .
• Date Type of date supports multiple time formats , such as UTC,GMT etc.

How to get the number of milliseconds of time ：
The way 1： Use static methods of classes ： Date.now();

//2.  Get the number of milliseconds of time 
var dateMilSecs = Date.now(); 
console.log(dateMilSecs);

The way 2： Using the getTime() Method

var date = new Date(); 
dateMilSecs = date.getTi