How to use the cftime.DatetimeProlepticGregorian function in cftime

def setUp(self):
        self.date1_365_day = DatetimeNoLeap(-5000, 1, 2, 12)
        self.date2_365_day = DatetimeNoLeap(-5000, 1, 3, 12)
        self.date3_gregorian = DatetimeGregorian(1969,  7, 20, 12)

        # last day of the Julian calendar in the mixed Julian/Gregorian calendar
        self.date4_gregorian = DatetimeGregorian(1582, 10, 4)
        # first day of the Gregorian calendar in the mixed Julian/Gregorian calendar
        self.date5_gregorian = DatetimeGregorian(1582, 10, 15)

        self.date6_proleptic_gregorian = DatetimeProlepticGregorian(1582, 10, 15)

        self.date7_360_day = Datetime360Day(2000, 1, 1)

        self.date8_julian = DatetimeJulian(1582, 10, 4)

        # a datetime.datetime instance (proleptic Gregorian calendar)
        self.datetime_date1 = datetime(1969,  7, 21, 12)

        self.delta = timedelta(hours=25)

def setUp(self):
        self.date1_365_day = DatetimeNoLeap(-5000, 1, 2, 12)
        self.date2_365_day = DatetimeNoLeap(-5000, 1, 3, 12)
        self.date3_gregorian = DatetimeGregorian(1969,  7, 20, 12)

        # last day of the Julian calendar in the mixed Julian/Gregorian calendar
        self.date4_gregorian = DatetimeGregorian(1582, 10, 4)
        # first day of the Gregorian calendar in the mixed Julian/Gregorian calendar
        self.date5_gregorian = DatetimeGregorian(1582, 10, 15)

        self.date6_proleptic_gregorian = DatetimeProlepticGregorian(1582, 10, 15)

        self.date7_360_day = Datetime360Day(2000, 1, 1)

        self.date8_julian = DatetimeJulian(1582, 10, 4)

        # a datetime.datetime instance (proleptic Gregorian calendar)
        self.datetime_date1 = datetime(1969,  7, 21, 12)

        self.delta = timedelta(hours=25)

delta = self.datetime_date1 - self.date3_gregorian
        # real_date2 and real_date1 are exactly one day apart
        self.assertEqual(total_seconds(delta), 86400)

        # subtracting datetime.datetime from netcdftime.datetime
        delta = self.date3_gregorian - self.datetime_date1
        # real_date2 and real_date1 are exactly one day apart
        self.assertEqual(total_seconds(delta), -86400)

        # Test the Julian/Gregorian transition.
        self.assertEqual(self.date5_gregorian - self.delta,
                         DatetimeGregorian(1582, 10, 3, 23))

        # The proleptic Gregorian calendar does not have invalid dates.
        self.assertEqual(self.date6_proleptic_gregorian - self.delta,
                         DatetimeProlepticGregorian(1582, 10, 13, 23))

        # The Gregorian calendar has no year zero.
        self.assertEqual(DatetimeGregorian(1, 1, 1) - self.delta,
                         DatetimeGregorian(-1, 12, 30, 23))

        # The 360_day calendar has year zero.

        self.assertEqual(self.date7_360_day - timedelta(days=2000 * 360),
                         Datetime360Day(0, 1, 1))

        # Test going over the year boundary.
        self.assertEqual(DatetimeGregorian(2000, 3, 1) - timedelta(days=29 + 31 + 31),
                         DatetimeGregorian(1999, 12, 1))

        # Year 2000 is a leap year.
        self.assertEqual(DatetimeGregorian(2000, 3, 1) - self.delta,

d = num2date(1, 'months since 0000-01-01 00:00:00', calendar='360_day')
        self.assertEqual(d, Datetime360Day(0,2,1))
        t = date2num(d, 'months since 0000-01-01 00:00:00', calendar='360_day')
        self.assertEqual(t, 1)
        # check that exception is raised if 'months since' used with
        # anything but the 360_day calendar.
        self.assertRaises(ValueError, num2date, \
             1, 'months since 01-01-01',calendar='standard')
        self.assertRaises(ValueError, utime, \
            'months since 01-01-01', calendar='standard')
        # issue #78 - extra digits due to roundoff
        assert(cftime.date2num(cftime.datetime(1, 12, 1, 0, 0, 0, 0, -1, 1), units='days since 01-01-01',calendar='noleap')  == 334.0)
        assert(cftime.date2num(cftime.num2date(1.0,units='days since 01-01-01',calendar='noleap'),units='days since 01-01-01',calendar='noleap') == 1.0)
        assert(cftime.date2num(cftime.DatetimeNoLeap(1980, 1, 1, 0, 0, 0, 0, 6, 1),'days since 1970-01-01','noleap') == 3650.0)
        # issue #126
        d = cftime.DatetimeProlepticGregorian(1, 1, 1)
        assert(cftime.date2num(d, 'days since 0001-01-01',\
            'proleptic_gregorian') == 0.0)
        # issue #140 (fractional seconds in reference date)
        d = datetime.strptime('2018-01-23 09:27:10.950000',"%Y-%m-%d %H:%M:%S.%f")
        units = 'seconds since 2018-01-23 09:31:42.94'
        assert(cftime.date2num(d, units) == -271.99)
        # issue 143 - same answer for arrays vs scalars.
        units = 'seconds since 1970-01-01 00:00:00'
        times_in = [1261440000.0, 1261440001.0, 1261440002.0, 1261440003.0,
                    1261440004.0, 1261440005.0]
        times_out1 = cftime.num2date(times_in, units)
        times_out2 = []
        for time_in in times_in:
            times_out2.append(cftime.num2date(time_in, units))
        dates1 = [str(d) for d in times_out1]
        dates2 = [str(d) for d in times_out2]

def setUp(self):
        self.date1_365_day = DatetimeNoLeap(-5000, 1, 2, 12)
        self.date2_365_day = DatetimeNoLeap(-5000, 1, 3, 12)
        self.date3_gregorian = DatetimeGregorian(1969,  7, 20, 12)

        # last day of the Julian calendar in the mixed Julian/Gregorian calendar
        self.date4_gregorian = DatetimeGregorian(1582, 10, 4)
        # first day of the Gregorian calendar in the mixed Julian/Gregorian calendar
        self.date5_gregorian = DatetimeGregorian(1582, 10, 15)

        self.date6_proleptic_gregorian = DatetimeProlepticGregorian(1582, 10, 15)

        self.date7_360_day = Datetime360Day(2000, 1, 1)

        self.date8_julian = DatetimeJulian(1582, 10, 4)

        # a datetime.datetime instance (proleptic Gregorian calendar)
        self.datetime_date1 = datetime(1969,  7, 21, 12)

        self.delta = timedelta(hours=25)

delta = self.datetime_date1 - self.date3_gregorian
        # real_date2 and real_date1 are exactly one day apart
        self.assertEqual(total_seconds(delta), 86400)

        # subtracting datetime.datetime from cftime.datetime
        delta = self.date3_gregorian - self.datetime_date1
        # real_date2 and real_date1 are exactly one day apart
        self.assertEqual(total_seconds(delta), -86400)

        # Test the Julian/Gregorian transition.
        self.assertEqual(self.date5_gregorian - self.delta,
                         DatetimeGregorian(1582, 10, 3, 23))

        # The proleptic Gregorian calendar does not have invalid dates.
        self.assertEqual(self.date6_proleptic_gregorian - self.delta,
                         DatetimeProlepticGregorian(1582, 10, 13, 23))

        # The Gregorian calendar has no year zero.
        self.assertEqual(DatetimeGregorian(1, 1, 1) - self.delta,
                         DatetimeGregorian(-1, 12, 30, 23))

        # The 360_day calendar has year zero.

        self.assertEqual(self.date7_360_day - timedelta(days=2000 * 360),
                         Datetime360Day(0, 1, 1))

        # Test going over the year boundary.
        self.assertEqual(DatetimeGregorian(2000, 3, 1) - timedelta(days=29 + 31 + 31),
                         DatetimeGregorian(1999, 12, 1))

        # Year 2000 is a leap year.
        self.assertEqual(DatetimeGregorian(2000, 3, 1) - self.delta,

assert (d1.dayofyr == d2.dayofyr == 60)
        d1 = DatetimeGregorian(2020,2,28,23,59,59)
        d2 = real_datetime(2020,2,28,23,59,59)
        assert (d1.dayofwk == d2.dayofwk == 4)
        assert (d1.dayofyr == d2.dayofyr == 59)
        d1 = DatetimeGregorian(1700,1,1)
        d2 = real_datetime(1700,1,1)
        assert (d1.dayofwk == d2.dayofwk == 4)
        assert (d1.dayofyr == d2.dayofyr == 1)
        # last day of Julian Calendar (Thursday)
        d1 = DatetimeJulian(1582, 10, 4, 12)
        d2 = DatetimeGregorian(1582, 10, 4, 12)
        assert (d1.dayofwk == d2.dayofwk == 3)
        assert (d1.dayofyr == d2.dayofyr == 277)
        # Monday in proleptic gregorian calendar
        d1 = DatetimeProlepticGregorian(1582, 10, 4, 12)
        d2 = real_datetime(1582,10,4,12)
        assert (d1.dayofwk == d2.dayofwk == 0)
        assert (d1.dayofyr == d2.dayofyr == 277)
        # issue 71: negative reference years
        # https://coastwatch.pfeg.noaa.gov/erddap/convert/time.html
        # gives 2446433 (365 days more - is it counting year 0?)
        # however http://aa.usno.navy.mil/data/docs/JulianDate.php gives
        # 2446068, which agrees with us
        units = "days since -4713-01-01T00:00:00Z"
        t = date2num(datetime(1985,1,2), units, calendar="standard")
        assert_almost_equal(t, 2446068)

        # issue #68: allow months since for 360_day calendar
        d = num2date(1, 'months since 0000-01-01 00:00:00', calendar='360_day')
        self.assertEqual(d, Datetime360Day(0,2,1))
        t = date2num(d, 'months since 0000-01-01 00:00:00', calendar='360_day')

def days_per_month_leap_year(date_type, month):
    if date_type is Datetime360Day:
        return [-1, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30][month]
    if date_type in [DatetimeGregorian, DatetimeProlepticGregorian,
                     DatetimeJulian, DatetimeAllLeap]:
        return [-1, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month]
    else:
        return [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month]

else:
            result = ut.date2num(value)

        if shape is not None:
            result = result.reshape(shape)

        return result


# Automatically register NetCDFTimeConverter with matplotlib.unit's converter
# dictionary.
if CalendarDateTime not in munits.registry:
    munits.registry[CalendarDateTime] = NetCDFTimeConverter()

CFTIME_TYPES = [cftime.DatetimeNoLeap, cftime.DatetimeAllLeap,
                cftime.DatetimeProlepticGregorian, cftime.DatetimeGregorian,
                cftime.Datetime360Day, cftime.DatetimeJulian]
for date_type in CFTIME_TYPES:
    if date_type not in munits.registry:
        munits.registry[date_type] = NetCDFTimeConverter()

def get_date_type(calendar):
    """Return the cftime date type for a given calendar name."""
    try:
        import cftime
    except ImportError:
        raise ImportError("cftime is required for dates with non-standard calendars")
    else:
        calendars = {
            "noleap": cftime.DatetimeNoLeap,
            "360_day": cftime.Datetime360Day,
            "365_day": cftime.DatetimeNoLeap,
            "366_day": cftime.DatetimeAllLeap,
            "gregorian": cftime.DatetimeGregorian,
            "proleptic_gregorian": cftime.DatetimeProlepticGregorian,
            "julian": cftime.DatetimeJulian,
            "all_leap": cftime.DatetimeAllLeap,
            "standard": cftime.DatetimeGregorian,
        }
        return calendars[calendar]