apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/config/BizConfig.java/BizConfig/accessKeyAuthTimeDiffTolerance
class BizConfig:  public int accessKeyAuthTimeDiffTolerance() {
    int authTimeDiffTolerance = getIntProperty("apollo.access-key.auth-time-diff-tolerance",
        DEFAULT_ACCESS_KEY_AUTH_TIME_DIFF_TOLERANCE);
    return checkInt(authTimeDiffTolerance, 1, Integer.MAX_VALUE,
        DEFAULT_ACCESS_KEY_AUTH_TIME_DIFF_TOLERANCE);
  }