Groovy String to Date

Question

I am coding this with Groovy   I am currently trying to convert a string that I have to a date without having to do anything too tedious    String theDate    28 09 2010 16 02 43   def newdate   new Date   parse  d M yyyy H m s   theDate    Output    Tue Aug 10 16 02 43 PST 2010   The above code works just fine  however when my string changes to something like   String testDate    Tue Aug 10 16 02 43 PST 2010  def newerdate   new Date   parse  d M yyyy H m s   testDate    It tells me that  there is no such value for Tue   I tried to throw an  E  in the parse for the date but it said the date was not able to be parsed   Can someone explain how I should go about parsing the second example

User · Answer

Googling around for Groovy ways to  cast  a String to a Date  I came across this article  http   www goodercode com wp intercept-method-calls-groovy-type-conversion   The author uses Groovy metaMethods to allow dynamically extending the behavior of any class  asType method  Here is the code from the website   class Convert       private from     private to      private Convert clazz    from   clazz       static def from clazz            new Convert clazz             def to clazz            to   clazz         return this            def using closure            def originalAsType   from metaClass getMetaMethod  asType      as Class            from metaClass asType     Class clazz - gt              if  clazz    to                     closure setProperty  value   delegate                  closure delegate                else                   originalAsType doMethodInvoke delegate  clazz                                    They provide a Convert class that wraps the Groovy complexity  making it trivial to add custom as-based type conversion from any type to any other   Convert from  String   to  Date   using   new java text SimpleDateFormat  MM-dd-yyyy   parse value     def christmas    12-25-2010  as Date   It s a convenient and powerful solution  but I wouldn t recommend it to someone who isn t familiar with the tradeoffs and pitfalls of tinkering with metaClasses

User · Answer

Below is the way we are going within our developing application   import java text SimpleDateFormat  String newDateAdded    2018-11-11T09 30 31  SimpleDateFormat dateFormat   new SimpleDateFormat  yyyy-MM-dd T HH mm ss   Date dateAdded   dateFormat parse newDateAdded   println dateAdded    The output looks like  Sun Nov 11 09 30 31 GMT 2018   In your example  we could adjust a bit to meet your need  If I were you  I will do   String datePattern    d M yyyy H m s  String theDate    28 09 2010 16 02 43  SimpleDateFormat df   new SimpleDateFormat datePattern  println df parse theDate    I hope this would help you much

User · Answer

Try this    def date   Date parse  E MMM dd H m s z yyyy   dateStr    Here are the patterns to format the dates

User · Answer

Date parse is deprecated   The alternative is     java text DateFormat parse    thereFore      new SimpleDateFormat  E MMM dd H m s z yyyy   Locale ARABIC  parse testDate    Note that SimpleDateFormat is an implementation of DateFormat

User · Answer

I think the best easy way in this case is to use parseToStringDate which is part of GDK  Groovy JDK enhancements    Parse a String matching the pattern EEE MMM dd HH mm ss zzz yyyy containing US-locale-constants only  e g  Sat for Saturdays   Such a string is generated by the toString method of Date  Example  println Date parseToStringDate  quot Tue Aug 10 16 02 43 PST 2010 quot   format  MM-dd-yyyy

User · Answer

JChronic is your best choice   Here s an example that adds a  fromString   method to the Date class that parses just about anything you can throw at it   Date metaClass  static  fromString     str - gt      com mdimension jchronic Chronic parse str  beginCalendar time     You can call it like this   println Date fromString  Tue Aug 10 16 02 43 PST 2010   println Date fromString  july 1  2012   println Date fromString  next tuesday

User · Answer

The first argument to parse   is the expected format  You have to change that to Date parse  E MMM dd H m s z yyyy   testDate  for it to work   Note you don t need to create a new Date object  it s a static method   If you don t know in advance what format  you ll have to find a special parsing library for that  In Ruby there s a library called Chronic  but I m not aware of a Groovy equivalent  Edit  There is a Java port of the library called jChronic  you might want to check it out

[string] Groovy String to Date

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