Auto Update date Modified for DateTime field

The answer to this might just be that it can't be done but if I have a table with a datetime type field, that I want to automatically update whenever the record is updated.  Now if the type was timestamp this could be done as follows:

ALTER TABLE `mytable` CHANGE `modified_date`, 'modified_date' TIMESTAMP ON UPDATE CURRENT_TIMESTAMP NOT NULL

However I can't get this to work with a DATETIME field.  I have tried variations such as NOW in place of CURRENT_TIMESTAMP with no luck.

Presumably this can be done with triggers, but I'd like to be able to do it via the basic attributes.
ApeAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
unfortunately, the "trick" with ON UPDATE CURRENT_TIMESTAMP is not "portable" to datetime data type with NOW() function.
you HAVE to stick with timestamp, or use triggers
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ApeAuthor Commented:
Not the answer I wanted, but the correct answer all the same.
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