A reference for datetime format

DateTime

Mostly about the java.time package, about time and date format issue.

Nothing Special, just for reference.

DateTime Format

y   = year   (yy or yyyy)
M   = month  (MM)
d   = day in month (dd)
h   = hour (0-12)  (hh)
H   = hour (0-23)  (HH)
m   = minute in hour (mm)
s   = seconds (ss)
S   = milliseconds (SSS)
z   = time zone  text        (e.g. Pacific Standard Time...)
Z   = time zone, time offset (e.g. -0800)

yyyy-MM-dd           (2009-12-31)
dd-MM-YYYY           (31-12-2009)
E hh:mm a            (Sun 1:18 PM)
E MMM yyyy           (Sun Jul 2015)
E MMMM yyyy          (Sun July 2015)
E MMMM yy            (Sun July 15)
EEEE MMMM yyyy       (Sunday July 2015)
    
yyyy-MM-dd HH:mm:ss  (2009-12-31 23:59:59)
HH:mm:ss.SSS         (23:59.59.999)

yyyy-MM-dd HH:mm:ss.SSS   (2009-12-31 23:59:59.999)
yyyy-MM-dd HH:mm:ss.SSS Z   (2009-12-31 23:59:59.999 +0100) 

Example: (Java 8) Use the java.time package:
####Code Here
   String str = "1996-08-08 12:30";
   DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
   LocalDateTime dateTime = LocalDateTime.parse(str, formatter);

Example: (java 8) import java.time.*;
####Problem Set
    Get the current date, and format it.
####Code here
    LocalDate date = LocalDate.now();
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd MMM yyyy");
    String one = date.format(formatter);
    System.out.println("Format Date: "+one);


Example:(Use the java.text.SimpleDateFormat package)
####Problem Set 
   How to format "2015-07-01 09:00:02" date to 9:00
####Code Here
   String str = "2015-07-01 09:00:02";
   Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(originalString);
   String newString = new SimpleDateFormat(H:mm).format(date);