cf.Datetime

class cf.Datetime(year, month=1, day=1, hour=0, minute=0, second=0, microsecond=0, dayofwk=-1, dayofyr=1, calendar=None)

Bases: netcdftime._netcdftime.DatetimeProlepticGregorian

A date-time object which supports CF calendars.

Any date-time in any CF calendar is allowed.

Comparion operations

Comparison operations are defined for cf.Datetime and datetime.datetime objects:

>>> cf.Datetime(2004, 2, 1) < cf.Datetime(2004, 2, 30)
True
>>> cf.Datetime(2004, 2, 1) <= cf.Datetime(2004, 2, 30)
True
>>> cf.Datetime(2004, 2, 1) > cf.Datetime(2004, 2, 30)
False
>>> cf.Datetime(2004, 2, 1) >= cf.Datetime(2004, 2, 30)
False
>>> cf.Datetime(2004, 2, 1) == cf.Datetime(2004, 2, 30)
False
>>> cf.Datetime(2004, 2, 1) != cf.Datetime(2004, 2, 30)
True
>>> cf.Datetime(2004, 2, 1, microsecond=1) > cf.Datetime(2004, 2, 1)
True

>>> import datetime
>>> cf.Datetime(2004, 2, 30) > datetime.datetime(2004, 2, 1)
True
>>> datetime.datetime(2004, 2, 1) > cf.Datetime(2004, 2, 30)
False

Arithmetic operations

Addition and subtraction operations are defined for cf.Datetime and cf.TimeDuration objects:

>>> cf.Datetime(2003, 2, 1) + cf.D(30)
<CF Datetime: 2003-03-03T00:00:00Z>
>>> cf.M(30) + cf.Datetime(2003, 2, 1)
<CF Datetime: 2003-03-03T00:00:00Z>
>>> cf.Datetime(2003, 2, 1, calendar='360_day') + cf.D(30)
<CF Datetime: 2003-03-01T00:00:00Z 360_day>
>>> cf.Datetime(2003, 2, 1, calendar='360_day') - cf.D(30)
<CF Datetime: 2003-01-01T00:00:00Z 360_day>

>>> cf.Datetime(2003, 2, 1) - cf.h(30)
<CF Datetime: 2003-01-30T18:00:00Z>
>>> cf.s(456) + cf.Datetime(2003, 2, 1)
<CF Datetime: 2003-02-01T00:07:36Z>

>>> cf.Datetime(2003, 2, 1) + cf.M(1)
<CF Datetime: 2003-03-01T00:00:00Z>
>>> cf.M(1) + cf.Datetime(2003, 2, 1, calendar='360_day') 
<CF Datetime: 2003-03-01T00:00:00Z 360_day>
>>> cf.Datetime(2003, 2, 1, calendar='noleap') + cf.M(245)
<CF Datetime: 2023-07-01T00:00:00Z noleap>
>>> cf.Datetime(2003, 2, 1) - cf.Y(2)
<CF Datetime: 2001-02-01T00:00:00Z>
>>> cf.Datetime(2003, 2, 1) - cf.Y(2) + cf.D(10)
<CF Datetime: 2001-02-11T00:00:00Z>

>>> d = cf.Datetime(2003, 2, 1)
>>> d += cf.s(34567689)
>>> d
<CF Datetime: 2004-03-07T02:08:09Z>

Attributes

Attribute	Description
year	The year of the date
month	The month of the year of the date
day	The day of the month of the date
hour	The hour of the day of the date
minute	The minute of the hour of the date
second	The second of the minute of the date
microsecond	The microsecond of the second of the date

Constructors

For convenience, the following functions may also be used to create cf.Datetime objects:

Function	Description
cf.dt	Create a date-time object.

For example:

>>> cf.dt(2001, 12, 3) == cf.dt('2001-12-3') == cf.Datetime(2001, 12, 3)
True
>>> cf.dt(cf.Datetime(2001, 12, 3)) == cf.Datetime(2001, 12, 3)
True
>>> import datetime
>>> cf.dt(datetime.datetime(2001, 12, 3)) == cf.Datetime(2001, 12, 3)
True

See also

cf.D, cf.dt, cf.h, cf.m, cf.M, cf.s, cf.TimeDuration, cf.Y

Methods

copy	Return a deep copy.
inspect	Inspect the attributes.
timetuple

Class methods

utcnow

Return the current Gregorian calendar UTC date and time.