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How to compare two dates using JavaScript

藏色散人

Release： 2021-08-18 14:28:04

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In the previous article "Detailed explanation of how to use JavaScript to print the content of div elements", I introduced how to use JavaScript to print the content of div elements. Interested friends can go and learn about it~

The main content of this article is to teach you how to use JavaScript to compare two dates!

In JavaScript, we can compare two dates by converting them into numerical values corresponding to their times. First, we can convert the Date to a numeric value using the getTime() function; then by converting the given date into a numeric value, we can then compare them directly.

For specific implementation methods, we can look at the following 3 examples:

Code example 1:

<!DOCTYPE html>
<html>
<head>
    <meta charset=utf-8 />
    <title></title>
    <script>
        // 当前日期
        var g1 = new Date();
        var g2 = new Date();
        if (g1.getTime() === g2.getTime())
            document.write("两者相等");
        else
            document.write("两者不相等");
        javascript: ;
    </script>
</head>
<body>
</body>
</html>

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Output:

两者相等

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Code example 2:

<!DOCTYPE html>
<html>
<head>
    <meta charset=utf-8 />
    <title></title>
    <script>

        var g1 = new Date();

        // (YYYY-MM-DD)

        var g2 = new Date(2019 - 08 - 03);

        if (g1.getTime() < g2.getTime())

            document.write("g1 小于 g2");

        else if (g1.getTime() > g2.getTime())

            document.write("g1 大于 g2");

        else

            document.write("两者相等");



        javascript: ;

    </script>
</head>
<body>

</body>
</html>

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Output:

g1 大于 g2

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Code example 3:

<!DOCTYPE html>
<html>
<head>
    <meta charset=utf-8 />
    <title></title>
    <script>

        var g1 = new Date(2019, 08, 03, 11, 45, 55);

        // (YYYY, MM, DD, Hr, Min, Sec)

        var g2 = new Date(2019, 08, 03, 10, 22, 42);

        if (g1.getTime() < g2.getTime())

            document.write("g1 小于 g2");

        else if (g1.getTime() > g2.getTime())

            document.write("g1 大于 g2");

        else

            document.write("两者相等");



        javascript: ;

    </script>
</head>
<body>

</body>
</html>

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Output:

g1 大于 g2

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Note:

getTime()The function of the getTime()

method is to return the number of milliseconds since January 1, 1970.

The syntax of getTime() is as follows:

dateObject.getTime()

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Return value: The number of milliseconds between the date and time specified by dateObject and midnight on January 1, 1970 (GMT time).

→This method is always used in conjunction with a Date object.

Finally, I would like to recommend "JavaScript Basics Tutorial

" ~ Welcome everyone to learn ~###

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