CoreAdminHome.invalidateArchivedReports API Question

Hi,

Does this API call take a date range, or a series of dates, or both?

Notice in this example, the second date is before the first, seeming to indicate these are just two unrelated days to invalidate.

?module=API&method=CoreAdminHome.invalidateArchivedReports&idSites=1,3,5&dates=2012-01-01,2011-10-15&token_auth=xyz

Is this a valid call?

?module=API&method=CoreAdminHome.invalidateArchivedReports&idSites=1,3,5&dates=2014-01-01,2012-01-01,2011-10-15&token_auth=xyz

Thanks!