LocalDateTime class is a class that gets the current date and time and specifies the display format.
Handles dates/hours without a timezone.
By using DateTimeFormatter class, you can format the acquired date and time into the specified display format.
In the process of ①, the display format is specified by the ofPattern method of the DateTimeFormatter class.
In the process of ②, it is set by the format method of the DateTimeFormatter class.
public class Sample {
public static void main(String[] args) {
//Get the current date and time
LocalDateTime nowDate = LocalDateTime.now();
System.out.println(nowDate); //2020-12-20T13:32:48.293
//Specify display format
DateTimeFormatter dtf1 =
DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss.SSS"); // ①
String formatNowDate = dtf1.format(nowDate); // ②
System.out.println(formatNowDate); // 2020/12/20 13:32:48.293
//Specify display format
DateTimeFormatter dtf2 =
DateTimeFormatter.ofPattern("yyyy year MM month dd day HH hour mm minute ss second E day");
String formatNowDate = dtf2.format(nowDate);
System.out.println(formatNowDate); //December 20, 2020 13:32:48 Sunday
//Specify display format
DateTimeFormatter dtf3 =
DateTimeFormatter.ofPattern("yyyyMMddHHmm");
String formatNowDate = dtf3.format(nowDate);
System.out.println(formatNowDate); // 202012201332
}
}
The Date class is a date and time class based on Unix time (the elapsed time from 00:00:00 on January 1, 1970).
The SimpleDateFormat class can format the acquired date and time into a specified display format.
public class Test1 {
public static void main(String[] args) {
//Get the current date and time
Date nowDate = new Date();
System.out.println(nowDate); //Sun Dec 20 13:56:23 JST 2020
//Specify display format
SimpleDateFormat sdf1
= new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");
String formatNowDate = sdf1.format(nowDate);
System.out.println(formatNowDate); // 2020/12/20 13:56:23.372
//Specify display format
SimpleDateFormat sdf2
= new SimpleDateFormat("yyyy year MM month dd day HH hour mm minute ss second");
String formatNowDate = sdf2.format(nowDate);
System.out.println(formatNowDate); //December 20, 2020 13:56:23
}
}
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