I have earlier temple dates for John
Could you please provide more information on the problem you have such as dates, temple, etc. so it can be investigated?
For John Curtis(s) 246B-H83, I have the following:
bap 7 Feb 1931
conf 7 Feb 1931
I found these dates on one of the LDS websites; i.e., IGI, IIGI, nFS, etc.
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This matter has been resolved via private message to the guest.