How to match three letter month name in Hive queries

[Thimuth Amarakoon]

Hi,

How can we match a date value like *2014-Dec-20* in unix_timestamp()? The
pattern *yyyy-MM-dd* matches 2014-12-20 format. But yyyy-mmm-dd or
yyyy-m-dd is not doing the trick for matching the month name.

Thanks and regards,
Thimuth