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16 The relativedelta type is designed to be applied to an existing datetime and
17 can replace specific components of that datetime, or represents an interval
18 of time.
19
20 It is based on the specification of the excellent work done by M.-A. Lemburg
21 in his
22 `mx.DateTime <https://www.egenix.com/products/python/mxBase/mxDateTime/>`_ extension.
23 However, notice that this type does *NOT* implement the same algorithm as
24 his work. Do *NOT* expect it to behave like mx.DateTime's counterpart.
25
26 There are two different ways to build a relativedelta instance. The
27 first one is passing it two date/datetime classes::
28
29 relativedelta(datetime1, datetime2)
30
31 The second one is passing it any number of the following keyword arguments::
32
33 relativedelta(arg1=x,arg2=y,arg3=z...)
34
35 year, month, day, hour, minute, second, microsecond:
36 Absolute information (argument is singular); adding or subtracting a
37 relativedelta with absolute information does not perform an arithmetic
38 operation, but rather REPLACES the corresponding value in the
39 original datetime with the value(s) in relativedelta.
40
41 years, months, weeks, days, hours, minutes, seconds, microseconds:
42 Relative information, may be negative (argument is plural); adding
43 or subtracting a relativedelta with relative information performs
44 the corresponding arithmetic operation on the original datetime value
45 with the information in the relativedelta.
46
47 weekday:
48 One of the weekday instances (MO, TU, etc) available in the
49 relativedelta module. These instances may receive a parameter N,
50 specifying the Nth weekday, which could be positive or negative
51 (like MO(+1) or MO(-2)). Not specifying it is the same as specifying
52 +1. You can also use an integer, where 0=MO. This argument is always
53 relative e.g. if the calculated date is already Monday, using MO(1)
54 or MO(-1) won't change the day. To effectively make it absolute, use
55 it in combination with the day argument (e.g. day=1, MO(1) for first
56 Monday of the month).
57
58 leapdays:
59 Will add given days to the date found, if year is a leap
60 year, and the date found is post 28 of february.
61
62 yearday, nlyearday:
63 Set the yearday or the non-leap year day (jump leap days).
64 These are converted to day/month/leapdays information.
65
66 There are relative and absolute forms of the keyword
67 arguments. The plural is relative, and the singular is
68 absolute. For each argument in the order below, the absolute form
69 is applied first (by setting each attribute to that value) and
70 then the relative form (by adding the value to the attribute).
71
72 The order of attributes considered when this relativedelta is
73 added to a datetime is:
74
75 1. Year
76 2. Month
77 3. Day
78 4. Hours
79 5. Minutes
80 6. Seconds
81 7. Microseconds
82
83 Finally, weekday is applied, using the rule described above.
84
85 For example
86
87 >>> from datetime import datetime
88 >>> from dateutil.relativedelta import relativedelta, MO
89 >>> dt = datetime(2018, 4, 9, 13, 37, 0)
90 >>> delta = relativedelta(hours=25, day=1, weekday=MO(1))
91 >>> dt + delta
92 datetime.datetime(2018, 4, 2, 14, 37)
93
94 First, the day is set to 1 (the first of the month), then 25 hours
95 are added, to get to the 2nd day and 14th hour, finally the
96 weekday is applied, but since the 2nd is already a Monday there is
97 no effect.
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165 values for the relative attributes.
166
167 >>> relativedelta(days=1.5, hours=2).normalized()
168 relativedelta(days=+1, hours=+14)
169
170 :return:
171 Returns a :class:`dateutil.relativedelta.relativedelta` object.
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