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#14766: Reflow the altered paragraphs.

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R David Murray 2012-05-14 22:33:36 -04:00
parent 089d4d4f7c
commit 8349bc2ba9
1 changed files with 17 additions and 17 deletions
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Doc/library/datetime.rst
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@ -14,8 +14,8 @@
The :mod:`datetime` module supplies classes for manipulating dates and times in
both simple and complex ways. While date and time arithmetic is supported, the
focus of the implementation is on efficient attribute extraction for output
formatting and manipulation. For related
functionality, see also the :mod:`time` and :mod:`calendar` modules.
formatting and manipulation. For related functionality, see also the
:mod:`time` and :mod:`calendar` modules.
There are two kinds of date and time objects: "naive" and "aware".
@ -26,22 +26,22 @@ is used to represent a specific moment in time that is not open to
interpretation [#]_.
+A naive object does not contain enough information to unambiguously locate
+itself relative to other date/time objects. Whether
a naive object represents Coordinated Universal Time (UTC),
local time, or time in some other timezone is purely up to the program, just
like it's up to the program whether a particular number represents metres,
miles, or mass. Naive objects are easy to understand and to
work with, at the cost of ignoring some aspects of reality.
+itself relative to other date/time objects. Whether a naive object represents
Coordinated Universal Time (UTC), local time, or time in some other timezone is
purely up to the program, just like it's up to the program whether a particular
number represents metres, miles, or mass. Naive objects are easy to understand
and to work with, at the cost of ignoring some aspects of reality.
For applications requiring aware objects, :class:`.datetime` and :class:`.time` objects
have an optional time zone information attribute, :attr:`tzinfo`, that can be
set to an instance of a subclass of the abstract :class:`tzinfo` class. These
:class:`tzinfo` objects capture information about the offset from UTC time, the
time zone name, and whether Daylight Saving Time is in effect. Note that no
concrete :class:`tzinfo` classes are supplied by the :mod:`datetime` module.
Supporting timezones at whatever level of detail is required is up to the
application. The rules for time adjustment across the world are more political
than rational, and there is no standard suitable for every application.
For applications requiring aware objects, :class:`.datetime` and :class:`.time`
objects have an optional time zone information attribute, :attr:`tzinfo`, that
can be set to an instance of a subclass of the abstract :class:`tzinfo` class.
These :class:`tzinfo` objects capture information about the offset from UTC
time, the time zone name, and whether Daylight Saving Time is in effect. Note
that no concrete :class:`tzinfo` classes are supplied by the :mod:`datetime`
module. Supporting timezones at whatever level of detail is required is up to
the application. The rules for time adjustment across the world are more
political than rational, and there is no standard suitable for every
application.
The :mod:`datetime` module exports the following constants: