<!DESCRIPTION> This function verifies that a string is a valid time, in the form hh:mm:ss am/pm, where seconds are optional. It accepts military time (hour between 0 and 23) as long as am/pm isn't specified. It requires am/pm when the hour is less than or equal to 12. <!/DESCRIPTION>
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1. Copy code into the HEAD section of document
2. Put last coding into the BODY section of document -->
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