Most reliable way to get current date online?

what reliable way of getting current date online server in format can use in ios?

[edit]
maybe should explain why don't wish use instance:

code:

 nsdate *today1 = [nsdate date]; 

it's because don't intend allow user manipulate value changing date on his/hers device.

perhaps it's possible force nsdate fetched online instead of system date?

 

there's ios project communicate ntp servers, source should big help

http://code.google.com/p/ios-ntp/

 

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