Cipla — About expiry dates

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Hyderabad, Andhra Pradesh

Sirs; I have purchased two nos of your Eye/Ear drops with brand name CIPLOX-D.The following are the details. 1) CIPLOX-D B.No ZD3357, MFD Aug 2013, EXP OCT 2015 2) CIPLOX-D B.No ZC3178, MFD June2013, EXP NOV 2015 Can you explain how the item no 2 has longer life or item no 1 has shorter life.? Thank you, With regards A.PRAKASH E-14/4 DEFENCE LABS QUARTERS KANCHANBAGH HYDERABAD 500058