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How to use Date object

不言Original: 2019-01-30 14:51:234018browse

The Date object is a built-in object in JavaScript that can be used to handle dates and times, including days, months, years, hours, minutes, seconds and milliseconds. We will use new Date() to create a date object. After creating a Date object, you can use many methods to operate it. In this article, we will take a closer look at how to use the Date object.

Let’s first use the new keyword to create an instance of a Date object

var my_date = new Date（）
var my_date = new Date(milliseconds);
var my_date = new Date(&#39;date string&#39;);
var my_date = new Date(year, month[, date, hour, minute, second, millisecond]);

After creating an instance of the Date object, you can All methods of this object are accessed from the "my_date" variable.

The following parameters can be specified in the Date constructor

No parameters: If no parameters are specified in the constructor, the Date object will be set to the current date and time.

Milliseconds: Milliseconds can be specified as a numeric parameter. The date object will calculate the date and time by adding the specified number of milliseconds since noon on January 1, 1970

Date string: The string argument will be treated as a date and will be parsed using the Date.parse method .

The date of the Date parameter includes the following seven parameters:

year: A value representing the year of the date.

month: A numeric value representing the date and month. Starting from January 0 to December 11

date: A numeric value representing the date (optional)

hour: A numeric value representing the hour of the day (optional).

minute: A value representing minutes (optional).

second: A numerical value representing seconds (optional)

millisecond: A numerical value representing milliseconds (optional)

Let’s look at a specific example

Date:

<html>
<body>
<script type="text/javascript">
var d = new Date()
document.write(d.getDate())
document.write(".")
document.write(d.getMonth() + 1)
document.write(".")
document.write(d.getFullYear())
</script>
</body>
</html>

The current date displayed on the browser is: 2019.1.30

Time:

<html>
<body>
<script type="text/javascript">
var d = new Date()
document.write(d.getHours())
document.write(":")
document.write(d.getMinutes() + 1)
document.write(":")
document.write(d.getSeconds())
</script>
</body>
</html>

The current time displayed on the browser is: 14:40:43

You can also use setDate, setHour, etc. to set the date or time as a date object.

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php JavaScript String 构造函数 date 字符串对象

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