SimpleDateFormat date format (shallow)

Java uses the SimpleDateFormat class's constructor, SimpleDateFormat (String str), to construct a formatted date format.

Formats the specified Date object as a string in the specified format through the format (date date) method.

I wrote an example myself:

@Test Public voidtestBasicPTFWJG1 () {SimpleDateFormat SDF=NewSimpleDateFormat ("Yyyy-mm-dd hh:mm:ss"); Date Date=NULL; Try{Date= Sdf.parse ("2016-10-20 11:27:08"); } Catch(ParseException e) {e.printstacktrace (); } SimpleDateFormat sdf1=NewSimpleDateFormat ("Yyyymmddhhmmss"); String ABC=Sdf1.format (date); SimpleDateFormat SDF2=NewSimpleDateFormat ("Yyyymmddhhmmss"); String BCD=Sdf2.format (date); System.out.println ("Abc=" +ABC); System.out.println ("Bcd=" +BCD); }

The format of the string in the SimpleDateFormat constructor, and the meaning of the parts represented:

ImportJava.text.SimpleDateFormat;Importjava.util.Date; Public classtest{ Public Static voidMain (String args[]) {Date newtime=NewDate (); //set the time formatSimpleDateFormat SDF1 =NewSimpleDateFormat ("y-m-d h:m:s a E"); SimpleDateFormat SDF2=NewSimpleDateFormat ("Yy-mm-dd hh:mm:ss a E"); SimpleDateFormat sdf3=NewSimpleDateFormat ("yyyy-mmm-ddd hhh:mmm:sss a E"); SimpleDateFormat SDF4=NewSimpleDateFormat ("yyyyy-mmmm-dddd hhhh:mmmm:ssss a E"); //Gets the time, is the time of the machineString formatDate1 =Sdf1.format (newtime); String FormatDate2=Sdf2.format (newtime); String FormatDate3=Sdf3.format (newtime); String formatDate4=Sdf4.format (newtime);          System.out.println (FORMATDATE1);         System.out.println (FORMATDATE2);         System.out.println (FormatDate3);     System.out.println (FORMATDATE4); }}

The string "Yyyy-mm-dd Hh:mm:ss", Where:

YYYY: Represents the year (not case sensitive) assuming the year is 2017

"Y", "yyy", "yyyy" match all 4-bit full years such as: "2017"

"YY" matches the following two digits of the year: "15"

More than 4 digits will be preceded by the year with a "0" complement such as "YYYYY" corresponding to "02017"

MM: Represents the month (uppercase only) if the month is 9

"M" corresponds to "9"

"MM" corresponds to "09"

"MMM" corresponds to "Sep"

"MMMM" corresponds to "Sep"

Exceeds 3 bits, still corresponds to "September"

DD: Representative day (lowercase only) assumed to be number 13th

"D", "DD" corresponds to "13"

Exceeding 2 digits, the number is preceded by a "0" complement. For example, "dddd" corresponds to "0013"

HH: When represented (case-sensitive, uppercase 24-timing, lowercase 12-timing) assumed to be 15 o'clock

"H", "HH" corresponds to "15", more than 2 digits, the number is preceded by a "0" complement. For example, "HHHH" corresponds to "0015"

"H" corresponds to "3"

"HH" corresponds to "03", which exceeds 2 digits and adds "0" to the front of the number. For example, "HHHH" corresponds to "0003"

MM: Delegate (lowercase only) assuming 32 points

"M", "MM" corresponds to "32", more than 2 digits, will be preceded by the number of "0" complement. For example, "MMMM" corresponds to "0032"

SS: Represents seconds (lowercase only) assumed to be 15 seconds

"S", "SS" corresponds to "15", more than 2 bits, will be preceded by the number of "0" complement. For example, "SSSS" corresponds to "0015"

E: Delegate week (uppercase only) assumed to be Sunday

"E", "EE", "EEE" all correspond to "Sun"

"Eeee" corresponds to "Sunday", exceeding 4 digits, still corresponding to "Sunday"

A: On behalf of the morning or afternoon, if it is the morning corresponding to "AM", if it is the afternoon corresponding to "PM"

The delimiter "-" can be substituted with any other non-alphabetic character (or kanji), for example:

Partial Modifications:

Operation Result:

Reference: SimpleDateFormat date format (shallow)

SimpleDateFormat date format (shallow)