code: public static OffsetDateTime getCreationTime(ISnowflake entity)
      {
          Checks.notNull(entity, "Entity");
          return getCreationTime(entity.getIdLong());
      }
docs: Gets the creation-time of a JDA-entity by doing the reverse snowflake algorithm on its id.
  This returns the creation-time of the actual entity on Discords side, not inside JDA.
  
  @param  entity
  The JDA entity where the creation-time should be determined for
  
  @throws IllegalArgumentException
  If the provided entity is {@code null}
  
  @return The creation time of the JDA entity as OffsetDateTime