date_range = pandas.date_range(now, periods=length,
                                       freq=freq, tz=timezone)

range_array = numpy.arange(length)
random_array = numpy.random.randint(0, 100, size=length)
string_list = [random.choice(["a", "b", "c"]) for _ in range(length)]
combined = numpy.vstack((range_array, random_array, string_list)).T