installation - Mysql CONVERT_TZ returns null when using time_zone_name -


i hosting website on shared server. helpfully (not) refusing set timezone tables. not undone, set own using documentation (both ways) 1) via sql , 2 via tables in both cases tables have data. in both cases select convert_tz ('2015-09-15 23:59:00', from_tz, to_tz) returns null.

i have tried set on windows (again both ways)

again, returns null. if use select convert_tz ('2015-09-15 23:59:00', '+2:00','-1:00') works.

any ideas? alternatively, can provide code convert_tz?

delimiter $$ create definer=`root`@`localhost` function `convert_tz_shared`( local_date_time timestamp, local_tz varchar(50), dest_tz varchar(50)  ) returns datetime reads sql data deterministic begin      declare secs  int;      declare local_tz_secs int;      declare dest_tz_secs int;      declare tmp_tz varchar(50);      # convert if possible seconds       if (left(local_tz,1)='+' or left(local_tz,1)='-')                 set @tmp_tz:=substring(local_tz,2,length(local_tz));           set @local_tz_secs:=substring_index(@tmp_tz,':',1)*3600 + substring_index(@tmp_tz,':',-1)*60;           if (left(local_tz,1)='-')              set @local_tz_secs:= -@local_tz_secs;           end if;      end if ;       if (left(dest_tz,1)='+' or left(dest_tz,1)='-')                 set @tmp_tz:=substring(dest_tz,2,length(dest_tz));           set @dest_tz_secs:=substring_index(@tmp_tz,':',1)*3600 + substring_index(@tmp_tz,':',-1)*60;           if (left(dest_tz,1)='-')              set @dest_tz_secs:= -@dest_tz_secs;           end if;      end if;       if (left(dest_tz,1)<>'+' , left(dest_tz,1)<>'-')                set @dest_tz_secs:=             (select           # distinct n.name, n.time_zone_id, z.use_leap_seconds,           tt.offset          #, tt.is_dst, tt.abbreviation,          # from_unixtime(t.transition_time) p,           # t.transition_type_id          time_zone_name n          join time_zone z using(time_zone_id)          join time_zone_transition t using (time_zone_id)          join time_zone_transition_type tt           using(time_zone_id,transition_type_id)         name=dest_tz          , from_unixtime(t.transition_time)<=local_date_time          order from_unixtime(t.transition_time) desc         limit 1);     end if;      if (left(local_tz,1)<>'+' , left(local_tz,1)<>'-')            set @local_tz_secs:=       (select # distinct n.name, n.time_zone_id, z.use_leap_seconds,       tt.offset       #, tt.is_dst, tt.abbreviation,       # from_unixtime(t.transition_time) p,        # t.transition_type_id       time_zone_name n       join time_zone z using(time_zone_id)       join time_zone_transition t using (time_zone_id)       join time_zone_transition_type tt       using(time_zone_id,transition_type_id)       name=local_tz       , from_unixtime(t.transition_time)<=local_date_time       order from_unixtime(t.transition_time) desc       limit 1);       end if;        return date_add(local_date_time, interval (@dest_tz_secs - @local_tz_secs) second);       end$$       delimiter ;

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