Warning: Use of "localtime" without parentheses is ambiguous

While looking at the log produced by Request Tracker (RT) 4.2.12, I noticed there was a warning message about using “localtime” without parentheses.

Here’s the actual error message:

[warning]: Warning: Use of "localtime" without parentheses is ambiguous 
at /opt/rt4/sbin/../lib/RT/Interface/Email.pm line 526.

The solution which I found from here, fixed the problem:

On line 526 of file /opt/rt4/sbin/../lib/RT/Interface/Email.pm, replace:

localtime with localtime().

Thanks to the chap who posted the solution.