Some suggestions:

• EXPORT_OK and EXPORT_TAGS list undefined functions (func1 func2). My guess is you don't need those.
• You generally don't need the shebang line in a module (#!/usr/bin/perl).
• If you plan to upload this to CPAN, you should add POD.
• You should consider adding some checks on the inputs to your getSNTPTime sub.
• Typically, all the use lines appear at the top of the file (IO::Socket::INET, etc.).
• The module contains one named sub and several anonymous subs. It might be easier to maintain and understand if the anonymous subs were refactored out into named subs.

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