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| 1 | +Addition and Subtraction |
| 2 | +======================== |
| 3 | + |
| 4 | +To easily adding and subtracting time, you can use the ``add()`` and ``subtract()`` |
| 5 | +methods. |
| 6 | +Each method returns a new ``Pendulum`` instance. |
| 7 | + |
| 8 | +.. code-block:: python |
| 9 | +
|
| 10 | + import pendulum |
| 11 | +
|
| 12 | + dt = pendulum.create(2012, 1, 31, 0) |
| 13 | +
|
| 14 | + dt.to_datetime_string() |
| 15 | + '2012-01-31 00:00:00' |
| 16 | +
|
| 17 | + dt = dt.add(years=5) |
| 18 | + '2017-01-31 00:00:00' |
| 19 | + dt = dt.add(years=1) |
| 20 | + '2018-01-31 00:00:00' |
| 21 | + dt = dt.subtract(years=1) |
| 22 | + '2017-01-31 00:00:00' |
| 23 | + dt = dt.subtract(years=5) |
| 24 | + '2012-01-31 00:00:00' |
| 25 | +
|
| 26 | + dt = dt.add(months=60) |
| 27 | + '2017-01-31 00:00:00' |
| 28 | + dt = dt.add(months=1) |
| 29 | + '2017-02-28 00:00:00' |
| 30 | + dt = dt.subtract(months=1) |
| 31 | + '2017-01-28 00:00:00' |
| 32 | + dt = dt.subtract(months=60) |
| 33 | + '2012-01-28 00:00:00' |
| 34 | +
|
| 35 | + dt = dt.add(days=29) |
| 36 | + '2012-02-26 00:00:00' |
| 37 | + dt = dt.add(days=1) |
| 38 | + '2012-02-27 00:00:00' |
| 39 | + dt = dt.subtract(days=1) |
| 40 | + '2012-02-26 00:00:00' |
| 41 | + dt = dt.subtract(days=29) |
| 42 | + '2012-01-28 00:00:00' |
| 43 | +
|
| 44 | + dt = dt.add(weeks=3) |
| 45 | + '2012-02-18 00:00:00' |
| 46 | + dt = dt.add(weeks=1) |
| 47 | + '2012-02-25 00:00:00' |
| 48 | + dt = dt.subtract(weeks=1) |
| 49 | + '2012-02-18 00:00:00' |
| 50 | + dt = dt.subtract(weeks=3) |
| 51 | + '2012-01-28 00:00:00' |
| 52 | +
|
| 53 | + dt = dt.add(hours=24) |
| 54 | + '2012-01-29 00:00:00' |
| 55 | + dt = dt.add(hours=1) |
| 56 | + '2012-02-25 01:00:00' |
| 57 | + dt = dt.subtract(hours=1) |
| 58 | + '2012-02-29 00:00:00' |
| 59 | + dt = dt.subtract(hours=24) |
| 60 | + '2012-01-28 00:00:00' |
| 61 | +
|
| 62 | + dt = dt.add(minutes=61) |
| 63 | + '2012-01-28 01:01:00' |
| 64 | + dt = dt.add(minutes=1) |
| 65 | + '2012-01-28 01:02:00' |
| 66 | + dt = dt.subtract(minutes=1) |
| 67 | + '2012-01-28 01:01:00' |
| 68 | + dt = dt.subtract(minutes=24) |
| 69 | + '2012-01-28 00:00:00' |
| 70 | +
|
| 71 | + dt = dt.add(seconds=61) |
| 72 | + '2012-01-28 00:01:01' |
| 73 | + dt = dt.add(seconds=1) |
| 74 | + '2012-01-28 00:01:02' |
| 75 | + dt = dt.subtract(seconds=1) |
| 76 | + '2012-01-28 00:01:01' |
| 77 | + dt = dt.subtract(seconds=61) |
| 78 | + '2012-01-28 00:00:00' |
| 79 | +
|
| 80 | + dt = dt.add(years=3, months=2, days=6, hours=12, minutes=31, seconds=43) |
| 81 | + '2015-04-03 12:31:43' |
| 82 | + dt = dt.subtract(years=3, months=2, days=6, hours=12, minutes=31, seconds=43) |
| 83 | + '2012-01-28 00:00:00' |
| 84 | +
|
| 85 | + # You can also add or remove a timedelta |
| 86 | + dt.add_timedelta(timedelta(hours=3, minutes=4, seconds=5)) |
| 87 | + '2012-01-28 03:04:05' |
| 88 | + dt.sub_timedelta(timedelta(hours=3, minutes=4, seconds=5)) |
| 89 | + '2012-01-28 00:00:00' |
| 90 | +
|
| 91 | +.. note:: |
| 92 | + |
| 93 | + Passing negative values to ``add()`` is also possible and will act exactly |
| 94 | + like ``subtract()`` |
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