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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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