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28<h2><span class="refentrytitle">Class template dst_calculator</span></h2>
29<p>boost::date_time::dst_calculator &#8212; Dynamic class used to caluclate dst transition information. </p>
30</div>
31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> date_type_, <span class="bold"><strong>typename</strong></span> time_duration_type_&gt; 
33<span class="bold"><strong>class</strong></span> dst_calculator {
34<span class="bold"><strong>public</strong></span>:
35  <span class="emphasis"><em>// types</em></span>
36  <span class="bold"><strong>typedef</strong></span> time_duration_type_ time_duration_type;
37  <span class="bold"><strong>typedef</strong></span> date_type_          date_type;         
38
39  <span class="emphasis"><em>// <a href="dst_calculator.html#id2434887-bb">public static functions</a></em></span>
40  <span class="type">time_is_dst_result</span> 
41  <a href="dst_calculator.html#id2434891-bb">process_local_dst_start_day</a>(<span class="bold"><strong>const</strong></span> time_duration_type &amp;, <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span>, <span class="bold"><strong>long</strong></span>) ;
42  <span class="type">time_is_dst_result</span> 
43  <a href="dst_calculator.html#id2416537-bb">process_local_dst_end_day</a>(<span class="bold"><strong>const</strong></span> time_duration_type &amp;, <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span>, <span class="bold"><strong>long</strong></span>) ;
44  <span class="type">time_is_dst_result</span> 
45  <a href="dst_calculator.html#id2505648-bb">local_is_dst</a>(<span class="bold"><strong>const</strong></span> date_type &amp;, <span class="bold"><strong>const</strong></span> time_duration_type &amp;,
46               <span class="bold"><strong>const</strong></span> date_type &amp;, <span class="bold"><strong>const</strong></span> time_duration_type &amp;,
47               <span class="bold"><strong>const</strong></span> date_type &amp;, <span class="bold"><strong>const</strong></span> time_duration_type &amp;,
48               <span class="bold"><strong>const</strong></span> time_duration_type &amp;) ;
49  <span class="type">time_is_dst_result</span> 
50  <a href="dst_calculator.html#id2397912-bb">local_is_dst</a>(<span class="bold"><strong>const</strong></span> date_type &amp;, <span class="bold"><strong>const</strong></span> time_duration_type &amp;,
51               <span class="bold"><strong>const</strong></span> date_type &amp;, <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span>, <span class="bold"><strong>const</strong></span> date_type &amp;,
52               <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span>, <span class="bold"><strong>long</strong></span>) ;
53};</pre></div>
54<div class="refsect1" lang="en">
55<a name="id2631826"></a><h2>Description</h2>
56<div class="refsect2" lang="en">
57<a name="id2631830"></a><h3>
58<a name="id2434887-bb"></a><code class="computeroutput">dst_calculator</code> public static functions</h3>
59<div class="orderedlist"><ol type="1">
60<li>
61<pre class="literallayout"><span class="type">time_is_dst_result</span> 
62<a name="id2434891-bb"></a>process_local_dst_start_day(<span class="bold"><strong>const</strong></span> time_duration_type &amp; time_of_day,
63                            <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span> dst_start_offset_minutes,
64                            <span class="bold"><strong>long</strong></span> dst_length_minutes) ;</pre>
65<p>On this dst transition, the time label between the transition boundary and the boudary + the offset are invalid times. If before the boundary then still not in dst.
66
67</p>
68<div class="variablelist">
69<p class="title"><b>Parameters</b></p>
70<dl>
71<dt><span class="term">dst_length_minutes</span></dt>
72<dd><p>Number of minutes to adjust clock forward </p></dd>
73<dt><span class="term">dst_start_offset_minutes</span></dt>
74<dd><p>Local day offset for start of dst </p></dd>
75<dt><span class="term">time_of_day</span></dt>
76<dd><p>Time offset in the day for the local time </p></dd>
77</dl>
78</div>
79</li>
80<li>
81<pre class="literallayout"><span class="type">time_is_dst_result</span> 
82<a name="id2416537-bb"></a>process_local_dst_end_day(<span class="bold"><strong>const</strong></span> time_duration_type &amp; time_of_day,
83                          <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span> dst_end_offset_minutes,
84                          <span class="bold"><strong>long</strong></span> dst_length_minutes) ;</pre>
85<p>This is the calculation for the DST end day. On that day times prior to the conversion time - dst_length (1 am in US) are still in dst. Times between the above and the switch time are ambiguous. Times after the start_offset are not in dst.
86
87</p>
88<div class="variablelist">
89<p class="title"><b>Parameters</b></p>
90<dl>
91<dt><span class="term">dst_end_offset_minutes</span></dt>
92<dd><p>Local time of day for end of dst </p></dd>
93<dt><span class="term">time_of_day</span></dt>
94<dd><p>Time offset in the day for the local time </p></dd>
95</dl>
96</div>
97</li>
98<li>
99<pre class="literallayout"><span class="type">time_is_dst_result</span> 
100<a name="id2505648-bb"></a>local_is_dst(<span class="bold"><strong>const</strong></span> date_type &amp; current_day,
101             <span class="bold"><strong>const</strong></span> time_duration_type &amp; time_of_day,
102             <span class="bold"><strong>const</strong></span> date_type &amp; dst_start_day,
103             <span class="bold"><strong>const</strong></span> time_duration_type &amp; dst_start_offset,
104             <span class="bold"><strong>const</strong></span> date_type &amp; dst_end_day,
105             <span class="bold"><strong>const</strong></span> time_duration_type &amp; dst_end_offset,
106             <span class="bold"><strong>const</strong></span> time_duration_type &amp; dst_length_minutes) ;</pre>
107<p>Determines if the time is really in DST or not. Also checks for invalid and ambiguous.
108
109</p>
110<div class="variablelist">
111<p class="title"><b>Parameters</b></p>
112<dl>
113<dt><span class="term">current_day</span></dt>
114<dd><p>The day to check for dst </p></dd>
115<dt><span class="term">dst_end_day</span></dt>
116<dd><p>Ending day of dst for the given locality </p></dd>
117<dt><span class="term">dst_end_offset</span></dt>
118<dd><p>Time offset within day given in dst for dst boundary </p></dd>
119<dt><span class="term">dst_start_day</span></dt>
120<dd><p>Starting day of dst for the given locality </p></dd>
121<dt><span class="term">dst_start_offset</span></dt>
122<dd><p>Time offset within day for dst boundary </p></dd>
123<dt><span class="term">time_of_day</span></dt>
124<dd><p>Time offset within the day to check </p></dd>
125</dl>
126</div>
127</li>
128<li>
129<pre class="literallayout"><span class="type">time_is_dst_result</span> 
130<a name="id2397912-bb"></a>local_is_dst(<span class="bold"><strong>const</strong></span> date_type &amp; current_day,
131             <span class="bold"><strong>const</strong></span> time_duration_type &amp; time_of_day,
132             <span class="bold"><strong>const</strong></span> date_type &amp; dst_start_day,
133             <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span> dst_start_offset_minutes,
134             <span class="bold"><strong>const</strong></span> date_type &amp; dst_end_day,
135             <span class="bold"><strong>unsigned</strong></span> <span class="bold"><strong>int</strong></span> dst_end_offset_minutes, <span class="bold"><strong>long</strong></span> dst_length_minutes) ;</pre>
136<p>Determines if the time is really in DST or not. Also checks for invalid and ambiguous.
137
138</p>
139<div class="variablelist">
140<p class="title"><b>Parameters</b></p>
141<dl>
142<dt><span class="term">current_day</span></dt>
143<dd><p>The day to check for dst </p></dd>
144<dt><span class="term">dst_end_day</span></dt>
145<dd><p>Ending day of dst for the given locality </p></dd>
146<dt><span class="term">dst_end_offset_minutes</span></dt>
147<dd><p>Offset within day given in dst for dst boundary (eg 120 for US which is 02:00:00) </p></dd>
148<dt><span class="term">dst_length_minutes</span></dt>
149<dd><p>Length of dst adjusment (eg: 60 for US) </p></dd>
150<dt><span class="term">dst_start_day</span></dt>
151<dd><p>Starting day of dst for the given locality </p></dd>
152<dt><span class="term">dst_start_offset_minutes</span></dt>
153<dd><p>Offset within day for dst boundary (eg 120 for US which is 02:00:00) </p></dd>
154<dt><span class="term">time_of_day</span></dt>
155<dd><p>Time offset within the day to check </p></dd>
156</dl>
157</div>
158</li>
159</ol></div>
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