Java method of parsing dates and times - using the SimpleDateFormat class
During the development process, we often encounter the need to parse and process dates and times. Java provides many date and time related classes and methods, among which the SimpleDateFormat class is a very commonly used tool class for parsing and formatting dates and times.
SimpleDateFormat class is a class under the java.text package, through which we can convert the string representation of date and time into a Date object, or format the Date object into a string. Below we will introduce in detail how to use the SimpleDateFormat class for date and time parsing.
The following are some common predefined formatting patterns:
The following are some symbols used for custom modes:
The following is a simple example to format the current date and time into the specified string format:
import java.text.SimpleDateFormat; import java.util.Date; public class DateFormatExample { public static void main(String[] args) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String formattedDate = sdf.format(new Date()); System.out.println(formattedDate); } }
Run the above code, the current date and time will be output The formatted result, for example: "2021-01-01 12:00:00".
The following is a sample code for parsing date and time:
import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateParseExample { public static void main(String[] args) { String dateString = "2021-01-01 12:00:00"; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { Date date = sdf.parse(dateString); System.out.println(date); } catch (ParseException e) { e.printStackTrace(); } } }
Run the above code to parse the output string into the result of a Date object, for example: Fri Jan 01 12:00: 00 CST 2021.
It should be noted that the parse method of SimpleDateFormat may throw ParseException, so we need to handle exceptions in the code.
In actual development, SimpleDateFormat also provides many other methods, such as:
We can flexibly use these methods according to actual needs.
Summary
SimpleDateFormat class is a common tool class for parsing dates and times in Java. Through it, we can convert string representations of dates and times into Date objects, or format Date objects into strings. . This article introduces the basic usage of SimpleDateFormat, including methods for formatting dates and times and parsing dates and times. I hope this article can help you better understand and use the SimpleDateFormat class.
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