[JAVA] How to use SimpleDateFormat Class

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When I develop Java, I forget how to use it when I want to return today's date lightly
If you think about it, it's a simple date format like a class name

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Date date = new Date();                                 // Return today's date to Date type
String format = "yyyy-MM-dd";                           // Year(4)-Month(2)-Date(2) Format
SimpleDateFormat df = new SimpleDateFormat(format);     // Simple Formatter with Formatting to Return
String str = df.format(date);                           // Convert the value of the Date type to String using Formatter

System.out.println(str);

 

If today is February 10, 2024

2024-02-10

 

 

It will be printed out as .

The format I use often

"yyyy-MM-dd";    // 2020-07-22

"yyyy/MM/dd";    // 2020/07/22

"yyyy.MM.dd";    // 2020.07.22

"HH:mm:ss";      // 17:33:21

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Format Type

Letter	Date or Time Component	Presentation	Examples
G	Era designator	Text	AD
y	Year	Year	1996; 96
Y	Week year	Year	2009; 09
M	Month in year	Month	July; Jul; 07
w	Week in year	Number	27
W	Week in month	Number	2
D	Day in year	Number	189
d	Day in month	Number	10
F	Day of week in month	Number	2
E	Day name in week	Text	Tuesday; Tue
u	Day number of week (1 = Monday, ..., 7 = Sunday)	Number	1
a	Am/pm marker	Text	PM
H	Hour in day (0-23)	Number	0
k	Hour in day (1-24)	Number	24
K	Hour in am/pm (0-11)	Number	0
h	Hour in am/pm (1-12)	Number	12
m	Minute in hour	Number	30
s	Second in minute	Number	55
S	Millisecond	Number	978
z	Time zone	General time zone	Pacific Standard Time; PST; GMT-08:00
Z	Time zone	RFC 822 time zone	-0800
X	Time zone	ISO 8601 time zone	-08; -0800; -08:00

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Reference Site

https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

SimpleDateFormat (Java Platform SE 7 )

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[JAVA] SimpleDateFormat Class 사용하기

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2020.07.22 - [개발 창고/Java] - [JAVA] SimpleDateFormat Class 사용하기

[JAVA] SimpleDateFormat Class 사용하기