Conversion between Date and String/Long, datestring

Conversion between Date and String/Long, datestring

Below are several common types of conversions about dates:

Import java. text. parseException; import java. text. simpleDateFormat; import java. util. date; public class Date_String {@ SuppressWarnings ("deprecation") public static void main (String [] args) {SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd "); try {Date date = sdf. (parse ("5689741236589745631"); System. out. println ("date =" + date); // error message, because the parameter string in parse is not a specific string} catch (ParseException e) {e. the parse () method in the printStackTrace ();}/*** SimpleDateFormat class is used to convert a specific input string to an object of the Date class * parse () without a parameter, when converting a specific String to a Date class * Using parse () without parameters, the String to be parsed must follow the "Year-month-day (there must be a space) morning/afternoon hours: Minutes "* e. g.: 2011-11-21 am-12 11-10-2 am * The converted Date class is also in the system format, with poor readability */Date date Date = null; string s = ""; SimpleDateFormat sdf1 = new SimpleDateFormat (); try {date = sdf1.parse (s); System. out. println ("------ the System does not have the parse parameter Date ------" by default); System. out. println ("" + date); // Sun Jan 29 00:03:00 CST 2012} catch (ParseException e) {e. printStackTrace ();}/*** use the custom format SimpleDateFormat (String pattern) to convert the String to the Date Class Using parse (). * The Date class is also the system format, poor readability */Date date1 = null; String s1 = "2012-01-29-22-26-23 "; string pattern = "yyyy-MM-dd-HH-mm-ss"; SimpleDateFormat sdf11 = new SimpleDateFormat (pattern); try {date1 = sdf11.parse (s1); System. out. println ("------ parse ------ custom Date Format"); System. out. println ("" + date1); // Sun Jan 29 22:26:23 CST 2012} catch (ParseException e) {e. printStackTrace ();} // The creation parameter is a Long-type Date d = new Date (System. currentTimeMillis (); System. out. println ("d =" + d. toLocaleString (); // d = 13:49:29 // convert Date to Long to get the number of milliseconds in the current time long time = d. getTime (); System. out. println ("time =" + time); // time = 1475041769413 int date11 = d. getDate (); // 1-31 System. out. println ("date1 =" + date11); // date1 = 28 int day = d. getDay (); // 0-6, 0 indicates Sunday 6 indicates Saturday System. out. println ("day =" + day); // day = 3 int month = d. getMonth (); // 0-11, 0 indicates January 1, January, and 11 indicates January 1, December. out. println ("month =" + month); // month = 8 int year = d. getYear (); // The number of years from January 1, 1900 to System. out. println ("year =" + year); // year = 116 int hour = d. getHours (); // System of the current date. out. println ("hour =" + hour); // hour = 13 int minute = d. getMinutes (); // a fraction of the current date of the System. out. println ("minute =" + minute); // minute = 49 int second = d. getSeconds (); // The number of seconds of the current date System. out. println ("second =" + second); // second = 29 // convert Date to String newDate = ""; newDate = sdf. format (d); System. out. println ("newDate =" + newDate); // newDate = 2016-09-28 }}