Cisco timezone question

We have a Cisco 2800 w IOS 12.4.
Trying to change timezone
 tried:
clock timezone EDT -5  
but it does not understand the command.

Is there another way?
LVL 4
shard26Asked:
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JFrederick29Commented:
Use these commands:

clock timezone EST -5
clock summer-time EDT recurring
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shard26Author Commented:
it does not understand timezone command
invalid input detected at the "T" in timezone
0
shard26Author Commented:
was not in conf mode.  Rookie!!
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