code: public static long getTimestampMinusParameters(long targetTimestamp,
  			int numOfWeeks, int numOfDays, int numOfHours, int numOfMinutes,
  			int numOfSeconds) {
  		long sumOfParameters =
  				numOfWeeks * aWeek + numOfDays * aDay + numOfHours * anHour
  						+ numOfMinutes * aMinute + numOfSeconds * aSecond;
  		return targetTimestamp - sumOfParameters;
  	}
docs: Gets timestamp minus parameters.
  
  @param targetTimestamp the target timestamp
  @param numOfWeeks      the num of weeks
  @param numOfDays       the num of days
  @param numOfHours      the num of hours
  @param numOfMinutes    the num of minutes
  @param numOfSeconds    the num of seconds
  @return the timestamp minus parameters