[Zope] Updating object's modification timestamp?

Is there any way of updating an object's modification timestamp (_p_mtime or bobobase_modification_time(), from what I gather from the sources) programmatically through Python? How? -- Alexander Staubo http://www.mop.no/~alex/ "It has taken the planet Earth 4.5 billion years to discover it is 4.5 billion years old." --George Wald