mysql CONVERT_TZ null centos

I have a programmer who is using CONVERT_TZ in his code for a reports template using nvd3.
He tells me that there is a problem which is 'CONVERT_TZ null' on a centos box that we are working on.

I looked for a solution and found;
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql

However, this doesn't seem to work or it only works now and then and sometimes only on one server, not the other, yet they are both Centos 6.x using pretty much the same setup.

My question is.... does the programmer HAVE to use this or is there another way to achieve what ever he is trying to do?

Secondly, instead of or aside from the command above to fix the problem, is there something installed on one server which might not be installed on the other? I would much rather simply install what ever is missing over having to run mysql commands to fix the problem.
projectsAsked:
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Ray PaseurCommented:
...another way to achieve what ever he is trying to do?
Would help to have an explanation of what he's trying to do. CONVERT_TZ returns null when the arguments are invalid.
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_convert-tz
...something installed on one server which might not be installed on the other?
Unfortunately, there are a huge number of configuration options and variables.  Fortunately they are all documented online.
http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
http://dev.mysql.com/doc/refman/5.7/en/server-options.html
http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html
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projectsAuthor Commented:
As far as I can tell, the only difference in terms of what's installed would be the time zone files which are installed by default anyhow.

Since this question isn't helpful as it is, I will try to get more info from him. His reply to me at this moment is very ambiguous so I'll get more info and update.
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GaryCommented:
Just to be sure in the /usr/share/zoneinfo directory do you have the timezone files and nothing else?
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projectsAuthor Commented:
Not sure what nothing else means but yes, both servers seem to have their zone files and nothing else that I can see.
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projectsAuthor Commented:
The programmer is gone and I have no way of knowing why he needed or used this. I will need to ask the next programmer to find out why and change this so it is not needed.

Not sure how to close this now useless question.
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