Voicemail Time is Incorrect

When I call into my voicemail the time is incorrect. It always says the time in UTC time. I have changed the voicemail file in the following ways:

tz=central ; Timezone from zonemessages below. Irrelevant if envelope=no.

eastern=America/New_York|‘vm-received’ Q ‘digits/at’ IMp
central=America/Chicago|‘vm-received’ Q ‘digits/at’ IMp
central24=America/Chicago|‘vm-received’ q ‘digits/at’ H N 'hours’
military=Zulu|‘vm-received’ q ‘digits/at’ H N ‘hours’ 'phonetic/z_p’
european=Europe/Copenhagen|‘vm-received’ a d b ‘digits/at’ HM

999 => 1111,name,name@gmail.com

Are there other changes that I need to make?