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Converts the time specified as a string in the first parameter into the number of seconds since epoch. This function recognizes a wide variety of formats, including RFC 1123 (standard HTTP), RFC 850, ANSI C asctime , common log file format, Unix ls -l , and Windows dir , among others. When a time zone is not implicit in the first parameter, this function will use an optional time zone specified as the second parameter, such as "-0800" or "+0500" or "GMT". If the second parameter is omitted and the time zone is ambiguous, the local time zone is used.