Index - D
| dateFmt | Locale |
| dateTimeFmt | Locale |
| Day | Time |
| December | Time |
| decodeFloat | Prelude |
| defaultTimeLocale | Locale |
| delete | List |
| deleteBy | List |
| deleteFirstsBy | List |
| denominator | Ratio |
| deRefStablePtr | StablePtr |
| diffClockTimes | Time |
| digitToInt | Char |
| div | Prelude |
| divMod | Prelude |
| doesDirectoryExist | Directory |
| doesFileExist | Directory |
| doesNotExistErrorType | MarshalError |
| Double | Prelude |
| drop | Prelude, List |
| dropWhile | Prelude, List |