The background time in the react.js code is a string of numbers. How can it be converted into standard time?

how can the {item.time} background time in this code be converted into standard time if it is a string of numbers?

const dataSource = auditRuleList ? (auditRuleList.result && Array.isArray(auditRuleList.result))?auditRuleList.result.map((item,index)=><Step
            key={item.id} title={item.name} description={item.time} />) :[]:[];
            
            
        
        ![][1]


what does a string of numbers mean? Time stamp? If it is a timestamp, define the formatting function formater, in advance when writing description= {() = > this.formater (item.time)}

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