MGH_DT_PARSE Name
  
   MGH_DT_PARSE Purpose
  
   This procedure extracts date & time information from a string in
      extended ISO 8601 format.
Calling Sequence
  
   Result = MGH_DT_PARSE(Iso)
Positional Parameters
      Iso (input)
          A string scalar in ISO 8601 format
Outputs
  
   The function returns a structure with one or more of the following
      tags: 
          YEAR (integer)
              Year number 
    
     MONTH (byte) 
              Month number
          DAY (byte) 
      
       Day of month 
          HOUR (byte)
              Hour of day 
    
     MINUTE (byte) 
              Minute
          SECOND (float) 
      
       Second 
          ZONE (float) 
      
      Time zone in hours Restrictions
  
   - Years before 0 AD are not allowed (because minus signs are
          interpreted as date separators). 
###########################################################################
    This software is provided subject to the following conditions:
    1.  NIWA makes no representations or warranties regarding the
    
     accuracy of the software, the use to which the software may
    
     be put or the results to be obtained from the use of the
    
     software.  Accordingly NIWA accepts no liability for any loss
    
     or damage (whether direct of indirect) incurred by any person
          through the use of or reliance on the software.
    2.  NIWA is to be acknowledged as the original author of the
    
     software where the software is used or presented in any form. 
###########################################################################
Modification History
  
   Mark Hadfield, 1999-08: 
    
     Written as MGHDT_PARSE_ISO, based on routine STR2UTC in the CDS
    
     library (http://sohowww.nascom.nasa.gov/solarsoft/gen/idl/). 
  
   Mark Hadfield, 2000-08: 
    
     Copied (with no substantive changes in the code) into my new
          date-time library as MGH_DT_PARSE. 
  
   Mark Hadfield, 2001-05: 
    
     Converted from a procedure returning data via keyword 
    
     arguments to a function returning a structure. Moved the
          source file into my Motley library. 
  
   Mark Hadfield, 2001-10: 
    
     The result, which is a structure, no longer has the dummy tag
          (name "dummy") which was included to simplify the
          structure-building code.