Skip to main content
`Ctrl`+`K`

# pandas.DatetimeIndex

class pandas.DatetimeIndex(data=None, freq=<no_default>, tz=<no_default>, normalize=<no_default>, closed=<no_default>, ambiguous='raise', dayfirst=False, yearfirst=False, dtype=None, copy=False, name=None)

  Immutable ndarray-like of datetime64 data.

  Represented internally as int64, and which can be boxed to Timestamp objects that are subclasses of datetime and carry metadata.

  Changed in version 2.0.0: The various numeric date/time attributes (`day`, `month`, `year` etc.) now have dtype `int32`. Previously they had dtype `int64`.

  Parameters:
    dataarray-like (1-dimensional)

      Datetime-like data to construct index with.

    freqstr or pandas offset object, optional

      One of pandas date offset strings or corresponding objects. The string ‘infer’ can be passed in order to set the frequency of the index as the inferred frequency upon creation.

    tzpytz.timezone or dateutil.tz.tzfile or datetime.tzinfo or str

      Set the Timezone of the data.

    normalizebool, default False

      Normalize start/end dates to midnight before generating date range.

      Deprecated since version 2.1.0.

    closed{‘left’, ‘right’}, optional

      Set whether to include start and end that are on the boundary. The default includes boundary points on either end.

      Deprecated since version 2.1.0.

    ambiguous‘infer’, bool-ndarray, ‘NaT’, default ‘raise’

      When clocks moved backward due to DST, ambiguous times may arise. For example in Central European Time (UTC+01), when going from 03:00 DST to 02:00 non-DST, 02:30:00 local time occurs both at 00:30:00 UTC and at 01:30:00 UTC. In such a situation, the ambiguous parameter dictates how ambiguous times should be handled.

      - ‘infer’ will attempt to infer fall dst-transition hours based on order

      - bool-ndarray where True signifies a DST time, False signifies a non-DST time (note that this flag is only applicable for ambiguous times)

      - ‘NaT’ will return NaT where there are ambiguous times

      - ‘raise’ will raise an AmbiguousTimeError if there are ambiguous times.

    dayfirstbool, default False

      If True, parse dates in data with the day first order.

    yearfirstbool, default False

      If True parse dates in data with the year first order.

    dtypenumpy.dtype or DatetimeTZDtype or str, default None

      Note that the only NumPy dtype allowed is datetime64[ns].

    copybool, default False

      Make a copy of input ndarray.

    namelabel, default None

      Name to be stored in the index.

  Attributes

  `year` | The year of the datetime.
  `month` | The month as January=1, December=12.
  `day` | The day of the datetime.
  `hour` | The hours of the datetime.
  `minute` | The minutes of the datetime.
  `second` | The seconds of the datetime.
  `microsecond` | The microseconds of the datetime.
  `nanosecond` | The nanoseconds of the datetime.
  `date` | Returns numpy array of python `datetime.date` objects.
  `time` | Returns numpy array of `datetime.time` objects.
  `timetz` | Returns numpy array of `datetime.time` objects with timezones.
  `dayofyear` | The ordinal day of the year.
  `day_of_year` | The ordinal day of the year.
  `dayofweek` | The day of the week with Monday=0, Sunday=6.
  `day_of_week` | The day of the week with Monday=0, Sunday=6.
  `weekday` | The day of the week with Monday=0, Sunday=6.
  `quarter` | The quarter of the date.
  `tz` | Return the timezone.
  `freqstr` | Return the frequency object as a string if it's set, otherwise None.
  `is_month_start` | Indicates whether the date is the first day of the month.
  `is_month_end` | Indicates whether the date is the last day of the month.
  `is_quarter_start` | Indicator for whether the date is the first day of a quarter.
  `is_quarter_end` | Indicator for whether the date is the last day of a quarter.
  `is_year_start` | Indicate whether the date is the first day of a year.
  `is_year_end` | Indicate whether the date is the last day of the year.
  `is_leap_year` | Boolean indicator if the date belongs to a leap year.
  `inferred_freq` | Tries to return a string representing a frequency generated by infer_freq.

  freq |

  Methods

  `normalize`(*args, **kwargs) | Convert times to midnight.
  `strftime`(date_format) | Convert to Index using specified date_format.
  `snap`([freq]) | Snap time stamps to nearest occurring frequency.
  `tz_convert`(tz) | Convert tz-aware Datetime Array/Index from one time zone to another.
  `tz_localize`(tz[, ambiguous, nonexistent]) | Localize tz-naive Datetime Array/Index to tz-aware Datetime Array/Index.
  `round`(*args, **kwargs) | Perform round operation on the data to the specified freq.
  `floor`(*args, **kwargs) | Perform floor operation on the data to the specified freq.
  `ceil`(*args, **kwargs) | Perform ceil operation on the data to the specified freq.
  `to_period`(*args, **kwargs) | Cast to PeriodArray/PeriodIndex at a particular frequency.
  `to_pydatetime`(*args, **kwargs) | Return an ndarray of `datetime.datetime` objects.
  `to_series`([index, name]) | Create a Series with both index and values equal to the index keys.
  `to_frame`([index, name]) | Create a DataFrame with a column containing the Index.
  `month_name`(*args, **kwargs) | Return the month names with specified locale.
  `day_name`(*args, **kwargs) | Return the day names with specified locale.
  `mean`(*[, skipna, axis]) | Return the mean value of the Array.
  `std`(*args, **kwargs) | Return sample standard deviation over requested axis.

  See also

  `Index`

    The base pandas Index type.

  `TimedeltaIndex`

    Index of timedelta64 data.

  `PeriodIndex`

    Index of Period data.

  `to_datetime`

    Convert argument to datetime.

  `date_range`

    Create a fixed-frequency DatetimeIndex.

  Notes

  To learn more about the frequency strings, please see this link.

  Examples

      >>> idx = pd.DatetimeIndex(["1/1/2020 10:00:00+00:00", "2/1/2020 11:00:00+00:00"])
      >>> idx
      DatetimeIndex(['2020-01-01 10:00:00+00:00', '2020-02-01 11:00:00+00:00'],
      dtype='datetime64[ns, UTC]', freq=None)