Photos not sorting chronologically anymore

my friend imported his photos from iPhoto on an old machine to iPhoto 9.5.1 on his mac laptop (OX S 10.9.5).  in the apple forums, there appear to be multiple versions of iPhoto that have had this problem.  Sorting the photos via events leaves them sorted apparently randomly

what are the workarounds (other than pretending to attach a file to an email to have temporarily access to the correct sorting order)

is there a way to reimport them? or another software program that has better functionality than the native programs?

thanks for any leads
Martin DDigital Privacy CoachAsked:
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IPhoto has been replaced by Photos in OS X 10.10. Could be simpler to just use it

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Martin DDigital Privacy CoachAuthor Commented:
he had not upgraded to yosemite yet which is when Photos replaces iphoto.  hopefully the upgrade will fix his issue.  thanks.
Yep usually upgrades fixes these kind of things,
Thanks glad to have helped.
regards Merete
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