Add DateUtils methods to implement before and after time-insensitive
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                 Key: LANG-400
                 URL: https://issues.apache.org/jira/browse/LANG-400
             Project: Commons Lang
          Issue Type: New Feature
    Affects Versions: 2.3
            Reporter: Paul Benedict
             Fix For: 2.4


The JDK contains Date.before() and Date.after() but no time-insensitive 
versions exist. I am typically in the situation where TIMESTAMP columns are 
converted into Date instances and I need to compare dates only for business 
rules.

I propose to complete DateUtils.isSameDay:
DateUtils.isBeforeDay
DateUtils.isAfterDay

My private implementations convert Date to Calendar, zero-out the time 
elements, and then compare.

PS: I would also deprecate isSameXXX methods in 2.4 and rename it to isEqualXXX 
since sameness usually implies instance equality, rather than object equality.

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