Comparing two joda DateTime instances

Question

I have a problem with the comparing two DateTime objects   System out println response getCreationDate   toString        will return  2013-12-31T22 59 21 000 01 00   but     assertThat response getCreationDate    equalTo new DateTime  2013-12-31T22 59 21 01 00         will throw an assertation error with the following error  Expected   lt 2013-12-31T22 59 21 000 01 00 gt   but  was  lt 2013-12-31T22 59 21 000 01 00 gt    Anyone has an idea what am I missing here   Btw  if you are wondering why the DateTime is displayed in GMT 1 00 zone  cause that s the timezone in which I want my DateTime objects to be by default   Thanks

User · Answer

This code  example         Chronology ch1   GregorianChronology getInstance        Chronology ch2   ISOChronology getInstance         DateTime dt   new DateTime  2013-12-31T22 59 21 01 00  ch1       DateTime dt2   new DateTime  2013-12-31T22 59 21 01 00  ch2        System out println dt       System out println dt2        boolean b   dt equals dt2        System out println b     Will print    2013-12-31T16 59 21 000-05 00 2013-12-31T16 59 21 000-05 00 false   You are probably comparing two DateTimes with same date but different Chronology

User · Answer

DateTime inherits its equals method from AbstractInstant  It is implemented as such  public boolean equals Object readableInstant           must be to fulfil ReadableInstant contract     if  this    readableInstant            return true            if  readableInstant instanceof ReadableInstant    false            return false            ReadableInstant otherInstant    ReadableInstant  readableInstant      return         getMillis      otherInstant getMillis    amp  amp          FieldUtils equals getChronology    otherInstant getChronology         Notice the last line comparing chronology  It s possible your instances  chronologies are different

[java] Comparing two joda DateTime instances

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