java - Date Parsing using SimpleDateFormat and parsePosition -

i trying parse string date object.previously used parse(string) definition date 4/1/2004 2:00:00asasasas getting correctly parsed wrong.so used parseposition signature parse(string,parseposition) , checked if index not equal length invalid date.but above logic fails string "4/1/2004 2:00:00 am.although it's valid date due index , length logic says invalid date when try parse in "m/dd/yyyy" format. parser parses correct date part , not take whole string consideration. way achieve ? formatstr can format pattern.

please advise.

public static void main(string[] args) {         string formatstr="m/dd/yyyy";     simpledateformat sd = new simpledateformat(formatstr, locale.getdefault());         string str = "4/1/2004 2:00:00 am";          parseposition pp1 = new parseposition(0);          date retdate = sd.parse(str, pp1);         if(retdate==null ||pp1.getindex()!=str.length() ){             system.out.println("i have invalid date");          }      } 

two ways can fix problem.

parse date out of string , use format

public static void main(string[] args) throws exception {     string formatstr = "mm/dd/yyyy";     simpledateformat sd = new simpledateformat(formatstr, locale.getdefault());     string str = "4/1/2004 2:00:00 am";      parseposition pp1 = new parseposition(0);      string justdate = str.substring(0, str.indexof(" "));     date retdate = sd.parse(justdate, pp1);     if (retdate == null || pp1.getindex() != justdate.length()) {         system.out.println("i have invalid date");     } else {         system.out.println("i have valid date");     } } 

or use correct format string you're testing

public static void main(string[] args) throws exception {     string formatstr = "mm/dd/yyyy hh:mm:ss aa";     simpledateformat sd = new simpledateformat(formatstr, locale.getdefault());     string str = "4/1/2004 2:00:00 am";      parseposition pp1 = new parseposition(0);      date retdate = sd.parse(str, pp1);     if (retdate == null || pp1.getindex() != str.length()) {         system.out.println("i have invalid date");     } else {         system.out.println("i have valid date");     } } 

results:

i have valid date