Formula Error

Could you please advise what is wrong with this:
 if {@NextDate01} or {@NextDate02} or {@NextDate03} in Date (2014,01,01 ) to  Date (2014,01,31 ) then result = "January 2014"
Gordon HughesDirectorAsked:
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Éric MoreauSenior .Net ConsultantCommented:
I would try:

if {@NextDate01} in Date (2014,01,01 ) to  Date (2014,01,31 )
or {@NextDate02} in Date (2014,01,01 ) to  Date (2014,01,31 )
or {@NextDate03} in Date (2014,01,01 ) to  Date (2014,01,31 ) then result = "January 2014"

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Gordon HughesDirectorAuthor Commented:
if i modify the formula to
 if ({@NextDate01}) in Date (2014,01,01 ) to  Date (2014,01,31 ) then "January 2014"

it works, but I would like the formula to look at several values
  if ({@NextDate01} or {@NextDate02}) in Date (2014,01,01 ) to  Date (2014,01,31 ) then "January 2014"
but it says it requies a boolean
Any ideas, can it be done?
Éric MoreauSenior .Net ConsultantCommented:
have you tried my last comment?
Gordon HughesDirectorAuthor Commented:
Hi Eric

Yes I did and have awarded you the points
Gordon HughesDirectorAuthor Commented:
Very good
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