Change headers value when user inject in gatling scenario

I want to change headers value every time when user injected in Gatling. because I have an error in my code when code is running. error is " Signature expired: 20200124T170359Z is now earlier than 20200124T170552Z (20200124T172052Z - 15 min. ".My code is

val signer: AwsSigner = AwsSigner(AwsCredentialsProviderWithSession, region, Service, clock)val signedHeaders = signer.getSignedHeaders(Uri, PostMethod, queryParams, headers, emptyPayload) val scen =scenario("Home page").repeat(100) { .exec(     http("Custom headers")       .get("Url"+"?Action=SendMessage&MessageBody="+ queryEnc)     .headers(signedHeaders)setUp(   sendLoadToAws.scen.inject(rampUsersPerSec(10) to 15  during (60)))