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# ->clean()
 -  returns null if not required
# validate strtotime formats
 -  accepts times parsable by strtotime
 -  accepts times parsable by strtotime
 -  throws a sfValidatorError if the time is a string and is not parsable by strtotime
 -  throws a sfValidatorError
# validate timestamp
 -  accepts timestamps as input
# validate date array
 -  accepts an array as an input
 -  accepts an array as an input
 -  accepts an array as an input
 -  accepts an array as an input
 -  accepts an array as an input
 -  throws a sfValidatorError if the time is not valid
 -  throws a sfValidatorError
 -  throws a sfValidatorError if the time is not valid
 -  throws a sfValidatorError
 -  throws a sfValidatorError if the time is not valid
 -  throws a sfValidatorError
# validate regex
 -  accepts a regular expression to match times
 -  throws a sfValidatorError if the time does not match the regex
 -  returns the expected time format in the error message
 -  throws a sfValidatorError
 -  returns the expected time format error if provided
# change date output
 -  output format can be change with the time_output option
 -  throws an exception if the time is empty and required is true
 -  throws an exception if the time is empty and required is true
 -  throws an exception if the time is empty and required is true
 -  throws an exception if the time is empty and required is true
# Looks like everything went fine.