Voicemail Timezone Configuration

I added those lines in the vm_general.inc

[code:1]
[zonemessages]
central=America/Chicago|‘vm-received’ Q ‘digits/at’ R
pacific=America/Tijuana|‘vm-received’ Q ‘digits/at’ R
mountain=America/Denver|‘vm-received’ Q ‘digits/at’ R
[/code:1]

and it has fixed it, but now it is giving the time in military format. I would like it to use am or pm. How could I get it to say the time differently?