Which Cisco router for NTP service

Hello,
I'm looking for deploying NTP service for multi-customer (in Datacenter).
So, I take a look at Cisco routers list and I saw that some router doesn't have hardware-clock / internal-clock ; for example 2600 series.
I'm looking for a "cheap" but good solution to provide NTP :
- "Cheap" : that's why I take a look at routers, and not directly NTP appliance.
- "Good" : something that can provide time to 300+ end-devices.
Cisco 800 series got hardware-clock, if I read good. But this is the cheapest router, so I don't feel confident.
> What's the "best" router for NTP server ?
> Please, could you share your experiences, opinions ?
Thanks,
Have a nice day.

Cisco 800 series apparently got internal clock, could it do the job correctly?
Rick and I have answered this question already.
Depends on the router, you can instruct the router to regularly update the hardware clock using the command "ntp update-calendar".
If you really insist on a router, an 800 router, then you can get all your device to sync to your router and your router gets sync somewhere in the internet.
Make sure you have the following commands:
ntp server <NTP server>
ntp update-calendar
Note: You can have multiple NTP server IP addresses. And the command above are hyperlinks.
Warning: DO NOT be tempted to use the command "ntp master".

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