mktime() error HELP PLEASE!!!!

I keep getting this message throughout my site

Warning: mktime() [function.mktime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/London' for 'BST/1.0/DST' instead in/home/petertmo/public_html/inc/classes/BxDolTemplate.php on line 306

Can anybody help please?

Put this in your master php.ini file:

date.timezone = "Europe/London"

If you have php.ini files that override the master file then you will need to put that line in each of them.

@ mscott , thank you very much with you, I have received has solved a problem that I have worked on it for 2 days. Thank you again

You're very welcome!

I install dolphin 7 in new dedicate server and I have same problem , and put php.ini in root and local one and ... but doesn't work and I have error about local time , what I have to do ? 

Warning: mktime() [function.mktime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/4.0/no DST' instead in/var/www/admin/data/www/euavanti.com/inc/classes/BxDolTemplate.php on line 306

http://euavanti.com/modules/?r=groups/browse/recent

This helped me under these requirements.

http://php.net/manual/en/datetime.configuration.php

 Did you restart Apache after you changed the php.ini?