Python Programming/Date and time

Examples:
 * time.sleep(5)
 * Sleep for five seconds. Keywords: pause, wait.
 * current_time = time.localtime
 * Gets the current date and time, as object of time.struct_time type.
 * print time.strftime("%Y-%m-%d", time.localtime)
 * Outputs the current date in the ISO format, e.g. 2016-03-20.
 * print time.strftime("%Y-%m-%d %H:%M:%S", time.localtime)
 * Outputs the current date and time, e.g. 2020-04-09 13:37:28.
 * baseClock = time.clock; time.sleep(5); print time.clock - baseClock
 * Outputs the time elapsed in seconds, as a floating-point number. Is slightly inaccurate.
 * print (datetime.date(2016, 3, 20) - datetime.date(2016, 2, 20)).days
 * Outputs number of days elapsed between two dates.
 * The type of the difference is datetime.timedelta.