AWS Signature for REST Get & Post

I tried making Rest AWS v4 Sig account, but it will not work, while the script from earlier worked perfectly (after few modifications in the timestamp, it wouldn’t work as it is on every time zone it seems). Now i can’t make the account work itself. I get the error “The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.” From my experience with the script earlier, could it be a bug in the signature generation code that it would not work properly for different time zones? I am 100% positive I used right credentials, since I copied them from same source that I have used for the script. I would not mind continue using the script itself, but the problem is the credentials remain hardcoded in the script code and are visible. Using an account would solve that problem.