MONTH_CNV

       Convert between a month name and  the equivalent number
 EXPLANATION: (e.g.,
       For example, converts from 'January' to 1  or vice-versa.

       Result = MONTH_CNV( MonthInput, [/UP, /LOW, /SHORT ] )

       MonthInput - either a string ('January', 'Jan', 'Decem', etc.) or
               an number from 1 to 12.  Scalar or array.

       UP - if set and if a string is being returned, it will be in all
               uppercase letters.
       LOW - if set and if a string is being returned, it will be in all
               lowercase letters.
       SHORT - if set and if a string is being returned, only the first
               three letters are returned.

       If the input is a string, the output is the matching month number.If
               an input string isn't a valid month name, -1 is returned.
       If the input is a number, the output is the matching month name.  The
               default format is only the first letter is capitalized.

       To get a vector of all the month names:
               Names = month_cnv(indgen(12)+1)

       Written by:     Joel Wm. Parker, SwRI, 1998 Dec 9

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