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The relativedelta type is designed to be applied to an existing datetime and
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can replace specific components of that datetime, or represents an interval
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of time.
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It is based on the specification of the excellent work done by M.-A. Lemburg
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in his
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`mx.DateTime <https://www.egenix.com/products/python/mxBase/mxDateTime/>`_ extension.
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However, notice that this type does *NOT* implement the same algorithm as
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his work. Do *NOT* expect it to behave like mx.DateTime's counterpart.
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There are two different ways to build a relativedelta instance. The
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first one is passing it two date/datetime classes::
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relativedelta(datetime1, datetime2)
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The second one is passing it any number of the following keyword arguments::
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relativedelta(arg1=x,arg2=y,arg3=z...)
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year, month, day, hour, minute, second, microsecond:
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Absolute information (argument is singular); adding or subtracting a
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relativedelta with absolute information does not perform an arithmetic
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operation, but rather REPLACES the corresponding value in the
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original datetime with the value(s) in relativedelta.
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years, months, weeks, days, hours, minutes, seconds, microseconds:
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Relative information, may be negative (argument is plural); adding
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or subtracting a relativedelta with relative information performs
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the corresponding arithmetic operation on the original datetime value
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with the information in the relativedelta.
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weekday:
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One of the weekday instances (MO, TU, etc) available in the
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relativedelta module. These instances may receive a parameter N,
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specifying the Nth weekday, which could be positive or negative
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(like MO(+1) or MO(-2)). Not specifying it is the same as specifying
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+1. You can also use an integer, where 0=MO. This argument is always
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relative e.g. if the calculated date is already Monday, using MO(1)
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or MO(-1) won't change the day. To effectively make it absolute, use
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it in combination with the day argument (e.g. day=1, MO(1) for first
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Monday of the month).
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leapdays:
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Will add given days to the date found, if year is a leap
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year, and the date found is post 28 of february.
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yearday, nlyearday:
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Set the yearday or the non-leap year day (jump leap days).
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These are converted to day/month/leapdays information.
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There are relative and absolute forms of the keyword
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arguments. The plural is relative, and the singular is
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absolute. For each argument in the order below, the absolute form
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is applied first (by setting each attribute to that value) and
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then the relative form (by adding the value to the attribute).
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The order of attributes considered when this relativedelta is
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added to a datetime is:
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1. Year
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2. Month
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3. Day
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4. Hours
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5. Minutes
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6. Seconds
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7. Microseconds
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Finally, weekday is applied, using the rule described above.
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For example
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>>> from datetime import datetime
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>>> from dateutil.relativedelta import relativedelta, MO
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>>> dt = datetime(2018, 4, 9, 13, 37, 0)
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>>> delta = relativedelta(hours=25, day=1, weekday=MO(1))
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>>> dt + delta
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datetime.datetime(2018, 4, 2, 14, 37)
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First, the day is set to 1 (the first of the month), then 25 hours
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are added, to get to the 2nd day and 14th hour, finally the
|
weekday is applied, but since the 2nd is already a Monday there is
|
no effect.
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Return a version of this object represented entirely using integer
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>>> relativedelta(days=1.5, hours=2).normalized()
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relativedelta(days=+1, hours=+14)
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:return:
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Returns a :class:`dateutil.relativedelta.relativedelta` object.
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