pandas.DatetimeIndex#

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

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.

tzzoneinfo.ZoneInfo, pytz.timezone, dateutil.tz.tzfile, datetime.tzinfo or str

Set the Timezone of the data.

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 a ValueError 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.
`freq`	Return the frequency object if it is set, otherwise None.
`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.

Methods

`normalize`()	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`(freq[, ambiguous, nonexistent])	Perform round operation on the data to the specified freq.
`floor`(freq[, ambiguous, nonexistent])	Perform floor operation on the data to the specified freq.
`ceil`(freq[, ambiguous, nonexistent])	Perform ceil operation on the data to the specified freq.
`to_period`([freq])	Cast to PeriodArray/PeriodIndex at a particular frequency.
`to_pydatetime`()	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`([locale])	Return the month names with specified locale.
`day_name`([locale])	Return the day names with specified locale.
`mean`(*[, skipna, axis])	Return the mean value of the Array.
`std`([axis, dtype, out, ddof, keepdims, skipna])	Return sample standard deviation over requested axis.