tweeper.php: make date handling functions a little more robust
authorAntonio Ospite <ao2@ao2.it>
Tue, 5 May 2015 07:21:48 +0000 (09:21 +0200)
committerAntonio Ospite <ao2@ao2.it>
Tue, 5 May 2015 07:21:48 +0000 (09:21 +0200)
Provide at least _some_ error checking and a fall-back value for invalid
dates.


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