[asterisk-users] meetme ${DATETIME} variable update

[nik600]

Hi i am experiencing this problem:

MEETME_RECORDINGFILE=/data/asterisk_data/_${DATETIME}_CONFERENCE

exten => 9999,1,MeetMe(666|1Arxq)

exten => 9998,1,MeetMe(666|1Axq)

exten => 9997,1,MeetMe(666|1xq)

I make a conference between 3 person dialing

A dials 9999
B dials 9998
C dials 9997

all works fine but the datetime won't be updated, it still remain for
example 13:40 until i do a complete restart of asterisk.

where can be the problem?