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<p>Set specific <em>value</em> for period <em>p</em>, note not all values are settable.</p>
<p>After call of set_value you may want to call <a class="el" href="classboost_1_1locale_1_1abstract__calendar.html#aa06fef77acaa6104e3cd2bc80ccc76d9">normalize()</a> function to make sure vall periods are updated, if you set sereral fields that are part of single date/time representation you should call set_value several times and then call <a class="el" href="classboost_1_1locale_1_1abstract__ca