案例:谭先生是某行政执法部门的编外雇员,与单位签订了3年期劳动合同。2012年4月合同期满时,谭先生因嫌工资低未再续签劳动合同。解除劳动关系时,谭先生提出3年来多次加班从未得加班费一事,单位只同意补发近一年的加班费,而对以前的加班费,却以其主张超过一年诉讼时效为由予以拒绝。谭先生如果申请劳动仲裁,其主张加班费能得到法律支持否? Case: Mr. Tan is a non-staffed employee of an administrative law enforcement department and has signed a three-year labor contract with the unit. At the expiration of the contract in April 2012, Mr. Tan did not renew his labor contract because of too much salary. When labor relations were lifted, Mr. Tan proposed that overtime work has never been overtime for many times in three years. The unit only agreed to reissue the overtime pay for nearly a year. On the grounds that the previous overtime pay was based on the limitation of one year's claim Refuse. If Mr. Tam applies for labor arbitration, does his claim that overtime pay be supported by law?