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? Java java?? ?? java8 DateTimeFormatter ??

java8 DateTimeFormatter ??

Jan 14, 2020 pm 03:45 PM
java8

java8 DateTimeFormatter ??

DateTimeFormatter? java8? ??? ???? ?????? ?????.

??? ??? ? ????. (?? ??: vjava ?? ) 

DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("EE yyyy-MM-dd hh:mm:ss");
String format = dateTimeFormatter.format(datetime);
System.out.println(format);

// Locale.US 的作用是格式化時(shí),會按照當(dāng)?shù)氐牧?xí)慣來格式化，如中國是 星期日，美國是Sun
DateTimeFormatter us = DateTimeFormatter.ofPattern("EE yyyy-MM-dd hh:mm:ss",Locale.US);
String us_format = us.format(datetime);
System.out.println(us_format);
e

dateTimeFormatter?? ??? ?? ????? ???? ?? ??? ?? ?????. 

//datetime，date，time
LocalDateTime now = LocalDateTime.now();
System.out.println(DateTimeFormatter.ISO_DATE_TIME.format(now));
System.out.println(DateTimeFormatter.ISO_DATE.format(now));
System.out.println(DateTimeFormatter.ISO_TIME.format(now));

//local  datetime，date，time
System.out.println(DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(now));
System.out.println(DateTimeFormatter.ISO_LOCAL_DATE.format(now));
System.out.println(DateTimeFormatter.ISO_LOCAL_TIME.format(now));

//毫秒
Instant now_instance = Instant.now();
System.out.println(DateTimeFormatter.ISO_INSTANT.format(now_instance));

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