Regarding timezone

Hello,

I want to change the timezone to Europe/Moscow. Moscow timezone is changing from +4 to +3

On the box, I have changed the timezone to MSK+3.

From the db side I have modified the following files:
1)    postgresql.conf

            timezone = 'Europe/Moscow'      

2)    pgsql/share/postgresql/timezonesets/Default

            MSK     10800    # Moscow Time (caution: this used to mean 10800)

                                     # (Europe/Moscow)
# date
Wed Sep 10 17:34:14 MSK 2014

Running following queries the output is as follows:
- select now()  =>   "2014-09-10 18:34:19.041994+04"
- select now() at time zone 'MSK'   =>  "2014-09-10 17:34:31.006944"

What changes needs to done so that now() returns expected value which matches with the time zone?

Thanks in advance!