Sort results by order in list

Hello,

I have a query like:
SELECT id, start_date FROM iddt WHERE id IN ('109k7','s3x6','sxmns','wt57'); which gives me:

+-------+---------------------+

| id    | start_date          |

+-------+---------------------+

| 109k7 | 2007-10-07 12:06:58 |
| sxmns | 2007-10-06 02:17:30 |
| wt57  | 2007-10-07 15:57:37 |

+-------+---------------------+

How can I get the results sorted by the order in which they appear in the ID list? Indeed I could do it in the application but prefer to get the results in the right order from MySQL as the ID list may be long and I may need only first few entries cropped by LIMIT clause. Ideally it should ORDER BY DATE(start_date) DESC and then by the ID list. Do I need some sort of stored function for that?

I.e. the ideal output would be:

+-------+---------------------+

| id    | start_date          |

+-------+---------------------+

| 109k7 | 2007-10-07 12:06:58 |
| s3x6  | 2007-10-07 08:58:20 |
| wt57  | 2007-10-07 15:57:37 |

+-------+---------------------+

Thanks

PaPa

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