How to format java date

1) Use the DateFormat class:

public String toString(Date d) {
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
return sdf.format(d);

}
2) Use the String.format() method.

String.format()的用法类似于C语言的printf，C语言转JAVA的同学一定会喜欢这个方式的。
public static String toString(Date d) {
String format = “%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS”;
return String.format(format, d);
}

The format string description is below
"%1$tY" % means escape, and the "1$tY" after it is the format description, which will be replaced at runtime. Will not be output as ordinary characters. Since a parameter

may be formatted multiple times, "1$" means formatting the first parameter, "tY" means formatting the year field in the time, then "%1$tY "Output the year in which the value of

is d, such as 2014, and by analogy: "%1$tm" outputs the month.
For specific formatting instructions, please refer to the javadoc of the java.util.Formatter class.
3) Use Calendar to format your own

public static String toString(Date d) {
Calendar c = Calendar.getInstance();
c.setTime(d);
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH) + 1;
int dayInMonth = c.get(Calendar.DAY_OF_MONTH);
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
int seconds = c.get(Calendar.SECOND);
String ret = String.valueOf(year);
ret += “-”;
ret += month < 10 ? “0″ + month : String.valueOf(month);
ret += “-”;
ret += dayInMonth < 10 ? “0″ + dayInMonth : String.valueOf(dayInMonth);
ret += ” “;
ret += hour < 10 ? “0″ + hour : String.valueOf(hour);
ret += “:”;
ret += minute < 10 ? “0″ + hour : String.valueOf(minute);
ret += “:”;
ret += seconds < 10 ? “0″ + hour : String.valueOf(seconds);
return ret;
}

The code is very simple, but it is a bit like reinventing the wheel.

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