Happy Birthday Traditional Cache
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Difficulty:
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Terrain:
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Size: 
(regular)
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This is a cache near the Oval in Pinelands. The Oval is a cricket/hockey ground with stunning views of Devil's Peak. This cache was set during a birthday party, during which the we built GPSs. Come and watch cricket on Saturdays in the summer, or hockey in the winter or just enjoy the view.
It will be useful to know the only date in d/mm format which is a palindrome and the first digit is the second digit squared plus three divided by two. (No - the lock is not damaged. It is checked regularly and kept well oiled. Please do not force it. Unlike a key lock, it clicks closed with a very short travel movement. With the lock closed, move the dials to 000. Please DO NOT move the dials while the lock is open. Thanks!)
Additional Hints
(Decrypt)
Va gur snxr ryrpgevp obk ba gur yrsg. Gur cnqybpx pbqr fgnegf jvgu gjb.