依據公共工程採購契約範本內契約「履約期限」章節都會約定「除天災或事變等不可抗力外，廠商不得以任何理由要求延長履約期限。」，而在「延遲履約」章節部分則敘明「機關及廠商因天災或事變等不可抗力或不可歸責於契約當事人之事由，致未能依時履約者，得展延履約期限；不能履約者，得免除契約責任。」並會舉例發生戰爭、敵對（不論宣戰與否）、侵略、外敵行動；叛亂(叛變)、恐怖攻擊、革命、暴動、軍事奪權或政變或內戰；暴亂、騷亂、混亂、罷工或與承攬廠商無涉之停業；與承攬廠商無涉之軍火、爆炸性物質、核子輻射或放射性污染；及發生自然災害如地震、颶風、颱風或火山爆發等等。據上述契約約定，申請人得否展延履約期限之要件、係以是否屬「不可抗力或不可歸責於契約當事人之事由」，而非以是否仍在契約約定「履約期限內」定之。然採購契約要項第45點，以日為單位計算逾期日數，尚無工作天、日曆天、假日之分別；至於雨天是否計入，依民法第231條之規定，債務人遲延者，債權人得請求其賠償因遲延而生之損害……債務人，故廠商倘工程已在遲延中，對於因不可抗力而生之損害，亦應負責。也就是說工程只要已逾期，如再遭遇不可抗力因素或非歸責於契約承攬廠商(當事人)事由導致實際竣工日期必須與原預定之日期更延後(逾期違約金將增加)，仍不得向業主(機關)主張申請展延履約期限，因此衍生許多爭訟。本研究試圖對此類事件合理性進行探討，並提出可能的建議。

According to the "Period of Performance" chapter in the public works procurement contract template, it is stipulated that "except for force majeure such as natural disasters or accidents, the manufacturer shall not request an extension of the performance period for any reason." , while in "Delay in Contract Performance", it is stated that "agencies and manufacturers who fail to perform the contract on time due to force majeure such as natural disasters, accidents or reasons not attributable to the parties to the contract may extend the time limit for performance of the contract; exempt from contractual liability." and by way of example war, hostilities (whether war be declared or not), invasion, act of foreign enemies, rebellion, terrorist attack, revolution, insurrection, military seizure of power, coup, civil war, riot, commotion, disorder, strike or lockout of which the Contractor is not involved; and the contractor is not involved in munitions, explosive substances, nuclear radiation or radioactive pollution; and natural disasters such as earthquakes, hurricanes, typhoons or volcanic eruptions, etc. According to the above-mentioned contract, the requirement for the applicant to extend the performance period is based on whether it is "force majeure or reasons not attributable to the parties to the contract", instead of depending on whether it is still within the "performance period" in the contract. However, in article 45 of the purchase contract, the number of overdue days is calculated in units of days, and there is no distinction between working days, calendar days, and holidays. As for the inclusive of rainy days, according to Article 231 of the Civil Code, if the debtor delays, the creditor can claim compensation for damages caused by the delay. . . The debtor shall also be liable for damages caused by force majeure if the project is delayed due to the manufacturer. That is to say, as long as the project is overdue, in case of force majeure or reasons not attributable to the parties to the contract, the actual completion date must be postponed from the original scheduled date (the liquidated damages will increase), and the owner shall not be claimed to apply for development. The deadline for performance of the contract was extended, resulting in many disputes. This study aims to explore the rationality of such events and puts forward possible suggestions.