#Go言語 ```go // これは固定値 const FORMAT = "2006-01-02T15:04:05-0700" posixTime := int64(1643004711) iso8601 := time.Unix(posixTime, 0).Format(FORMAT) fmt.Print(iso8601) // 2022-01-24T06:11:51+0000 ``` - [Playground](https://go.dev/play/p/hkwAkTysbed)