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I ran into an above error, AWS::S3::Errors::RequestTimeTooSkewed, when I tried to download an object from S3 using aws-sdk of ruby.

[2013-01-29T14:34:35+09:00] FATAL: AWS::S3::Errors::RequestTimeTooSkewed: ruby_block[something.s3.bucket/pub/archive-i-want.tar.ggz] (/foobar/fizbiz/s3.rb line 8) had an error: AWS::S3::Errors::RequestTimeTooSkewed: The difference between the request time and the current time is too large.

It was occurred that the clock of local machine was very late.

I updated the time with ntpdate.

$ sudo /usr/sbin/ntpdate
29 Jan 14:28:41 ntpdate[32495]: step time server offset -929.483212 sec

If you don’t have ntpdate, you can install with yum.

$ sudo yum install -y ntp