Java Cannot format given Object as a Date

Question

I have Date in this format   2012-11-17T00 00 00 000-05 00   I need to convert the date into this format mm yyyy   I tried this way  but I am getting this Exception   Exception in thread  main  java lang IllegalArgumentException  Cannot format given Object as a Date     at java text DateFormat format Unknown Source      at java text Format format Unknown Source      at DateParser main DateParser java 14    Please see my code below    import java text SimpleDateFormat  import java util Date   public class DateParser           public static void main String args                 String MonthYear   null              SimpleDateFormat simpleDateFormat   new SimpleDateFormat  mm yyyy                String dateformat    2012-11-17T00 00 00 000-05 00         MonthYear   simpleDateFormat format dateformat               System out println MonthYear

User · Answer

This worked for me   String dat  02 08 2017   long date new SimpleDateFormat  dd MM yyyy   parse dat newParsePosition 0   getTime    java sql Date dbDate new java sql Date date   System out println dbDate

User · Answer

I have resolved it   this way   import java text DateFormat  import java text ParseException  import java text SimpleDateFormat  import java util Date  import java util Locale   public class DateParser        public static void main String args    throws Exception            DateParser dateParser   new DateParser             String str   dateParser getparsedDate  2012-11-17T00 00 00 000-05 00            System out println str               private String getparsedDate String date  throws Exception           DateFormat sdf   new SimpleDateFormat  yyyy-MM-dd T HH mm ss SSS   Locale US           String s1   date          String s2   null          Date d          try               d   sdf parse s1               s2    new SimpleDateFormat  MM yyyy    format d              catch  ParseException e                 e printStackTrace                       return s2

User · Answer

DateFormat format only works on Date values   You should use two SimpleDateFormat objects  one for parsing  and one for formatting  For example      Note  MM is months  not mm DateFormat outputFormat   new SimpleDateFormat  MM yyyy   Locale US   DateFormat inputFormat   new SimpleDateFormat  yyyy-MM-dd T HH mm ss SSSX   Locale US    String inputText    2012-11-17T00 00 00 000-05 00   Date date   inputFormat parse inputText   String outputText   outputFormat format date     EDIT  Note that you may well want to specify the time zone and or locale in your formats  and you should also consider using Joda Time instead of all of this to start with - it s a much better date time API

User · Answer

java time  I should like to contribute the modern answer  The SimpleDateFormat class is notoriously troublesome  and while it was reasonable to fight one   s way through with it when this question was asked six and a half years ago  today we have much better in java time  the modern Java date and time API  SimpleDateFormat and its friend Date are now considered long outdated  so don   t use them anymore       DateTimeFormatter monthFormatter   DateTimeFormatter ofPattern  MM uuuu        String dateformat    2012-11-17T00 00 00 000-05 00       OffsetDateTime dateTime   OffsetDateTime parse dateformat       String monthYear   dateTime format monthFormatter       System out println monthYear     Output      11 2012   I am exploiting the fact that your string is in ISO 8601 format  the international standard  and that the classes of java time parse this format as their default  that is  without any explicit formatter  It   s stil true what the other answers say  you need to parse the original string first  then format the resulting date-time object into a new string  Usually this requires two formatters  only in this case we   re lucky and can do with just one formatter   What went wrong in your code   As others have said  SimpleDateFormat format cannot accept a String argument  also when the parameter type is declared to be Object  Because of the exception you didn   t get around to discovering  there is also a bug in your format pattern string  mm yyyy  Lowercase mm os for minute of the hour  You need uppercase MM for month  Finally the Java naming conventions say to use a lowercase first letter in variable names  so use lowercase m in monthYear  also because java time includes a MonthYear class with uppercase M  so to avoid confusion     Links   Oracle tutorial  Date Time explaining how to use java time  Wikipedia article  ISO 8601

User · Answer

SimpleDateFormat format      takes a Date as parameter and format Date to String  So you need have a look API carefully

User · Answer

You have one DateFormat  but you need two  one for the input  and another for the output   You ve got one for the output  but I don t see anything that would match your input   When you give the input string to the output format  it s no surprise that you see that exception   DateFormat inputDateFormat   new SimpleDateFormat  yyyy-MM-ddhh mm ss SSS-Z

User · Answer

public static String showDate        SimpleDateFormat df new SimpleDateFormat   nTime yyyy-MM-dd HH mm ss        System out println df format new Date          String s df format new Date         return s      I think this code may solve your problem

[java] Java : Cannot format given Object as a Date

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