message: Use milliseconds for timestamp
diff: @@ -716,8 +716,8 @@ pub trait OAuthClient: BaseClient {
  };
  let time_limit = match time_limit {
  - Some(TimeLimits::Before(y)) => Some(("before", y.timestamp().to_string())),
  - Some(TimeLimits::After(y)) => Some(("after", y.timestamp().to_string())),
  + Some(TimeLimits::Before(y)) => Some(("before", y.timestamp_millis().to_string())),
  + Some(TimeLimits::After(y)) => Some(("after", y.timestamp_millis().to_string())),
  None => None,
  };
  if let Some((name, value)) = time_limit.as_ref() {
  