Index - I
| intervalFormat | Data.Time.Format.ISO8601 | 
| isJulianLeapYear | Data.Time.Calendar.Julian | 
| isLeapYear | Data.Time.Calendar.OrdinalDate, Data.Time.Calendar, Data.Time | 
| ISO8601 | Data.Time.Format.ISO8601 | 
| iso8601DateFormat | Data.Time.Format, Data.Time | 
| iso8601Format | Data.Time.Format.ISO8601 | 
| iso8601ParseM | Data.Time.Format.ISO8601 | 
| iso8601Show | Data.Time.Format.ISO8601 |