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54 | <H2><A NAME="SECTION0081070000000000000000"> | |
55 | 6.10.7 <tt class="method">strftime()</tt> Behavior</A> | |
56 | </H2> | |
57 | ||
58 | <P> | |
59 | <tt class="class">date</tt>, <tt class="class">datetime</tt>, and <tt class="class">time</tt> | |
60 | objects all support a <code>strftime(<var>format</var>)</code> | |
61 | method, to create a string representing the time under the control of | |
62 | an explicit format string. Broadly speaking, | |
63 | <code>d.strftime(fmt)</code> | |
64 | acts like the <tt class="module"><a href="module-time.html">time</a></tt> module's | |
65 | <code>time.strftime(fmt, d.timetuple())</code> | |
66 | although not all objects support a <tt class="method">timetuple()</tt> method. | |
67 | ||
68 | <P> | |
69 | For <tt class="class">time</tt> objects, the format codes for | |
70 | year, month, and day should not be used, as time objects have no such | |
71 | values. If they're used anyway, <code>1900</code> is substituted for the | |
72 | year, and <code>0</code> for the month and day. | |
73 | ||
74 | <P> | |
75 | For <tt class="class">date</tt> objects, the format codes for hours, minutes, and | |
76 | seconds should not be used, as <tt class="class">date</tt> objects have no such | |
77 | values. If they're used anyway, <code>0</code> is substituted for them. | |
78 | ||
79 | <P> | |
80 | For a naive object, the <code>%z</code> and <code>%Z</code> format codes are | |
81 | replaced by empty strings. | |
82 | ||
83 | <P> | |
84 | For an aware object: | |
85 | ||
86 | <P> | |
87 | <DL COMPACT> | |
88 | <DT><code>%z</code></DT> | |
89 | <DD><tt class="method">utcoffset()</tt> is transformed into a 5-character string of | |
90 | the form +HHMM or -HHMM, where HH is a 2-digit string giving the | |
91 | number of UTC offset hours, and MM is a 2-digit string giving the | |
92 | number of UTC offset minutes. For example, if | |
93 | <tt class="method">utcoffset()</tt> returns <code>timedelta(hours=-3, minutes=-30)</code>, | |
94 | <code>%z</code> is replaced with the string <code>'-0330'</code>. | |
95 | ||
96 | <P> | |
97 | </DD> | |
98 | <DT><code>%Z</code></DT> | |
99 | <DD>If <tt class="method">tzname()</tt> returns <code>None</code>, <code>%Z</code> is replaced | |
100 | by an empty string. Otherwise <code>%Z</code> is replaced by the returned | |
101 | value, which must be a string. | |
102 | </DD> | |
103 | </DL> | |
104 | ||
105 | <P> | |
106 | The full set of format codes supported varies across platforms, | |
107 | because Python calls the platform C library's <tt class="function">strftime()</tt> | |
108 | function, and platform variations are common. The documentation for | |
109 | Python's <tt class="module"><a href="module-time.html">time</a></tt> module lists the format codes that the C | |
110 | standard (1989 version) requires, and those work on all platforms | |
111 | with a standard C implementation. Note that the 1999 version of the | |
112 | C standard added additional format codes. | |
113 | ||
114 | <P> | |
115 | The exact range of years for which <tt class="method">strftime()</tt> works also | |
116 | varies across platforms. Regardless of platform, years before 1900 | |
117 | cannot be used. | |
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