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## -*- mode: html; coding: utf-8; -*-
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<p>These are the functions and methodologies for date handling in CDS Invenio.</p>
<h2>Contents</h2>
<ol>
<li><a href="#overview">Overview</a></li>
<li><a href="#converting">Converting dates</a></li>
<li><a href="#i18n">Internationalizing parts of dates</a></li>
<li><a href="#generating">Generating GUI elements</a></li>
</ol>
<h2>1. <a name="overview">Overview</a></h2>
Three ways of representing dates are handled by this library:
<dl>
<dt><b>datetext:</b></dt>
<dd>textual format => <code>'YEAR-MONTH-DAY HOUR:MINUTE:SECOND'</code><br />
e.g. <code>'2005-11-16 15:11:44'</code><br />
default value: <code>'0000-00-00 00:00:00'</code><br />
This format is the the one used by current Database for storing dates.
</dd>
<dt><b>datestruct:</b></dt>
<dd>
tuple format => see <a href="http://docs.python.org/lib/module-time.html">Python reference</a> <br />
<code>(YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, WEEKDAY, YEARDAY, DAYLIGHT)</code><br />
e.g. <code>(2005, 11, 16, 15, 11, 44, 2, 320, 0)</code><br />
default value: <code>(0, 0, 0, 0, 0, 0, 0, 0, 0)</code><br />
This format is the one used by python. Time module provides methods for
calculations.
</dd>
<dt><b>dategui:</b></dt>
<dd>
textual format for output => <code>'DAY MONTH YEAR, HOUR:MINUTE'</code><br />
e.g. <code>'16 nov 2005, 15:11'</code>
default value: <code>_("N/A")</code>
</dd>
</dl>
<p>The dateutils python module provides ways of converting between these formats.
The default value is used whenever a date is non-valid (for python, dates before
epoch are unvalid!).</p>
<h2>2. <a name="converting">Converting dates</a></h2>
The functions for conversion are listed below.
<dl>
<dt><b><code>convert_datestruct_to_dategui(datestruct, ln=cdslang)</code></b></dt>
<dd>
<code>(2005, 11, 16, 15, 11, 44, 2, 320, 0) => '16 nov 2005, 15:11'</code><br/>
Month is internationalized
</dd>
<dt><b><code>convert_datestruct_to_datetext(datestruct)</code></b></dt>
<dd>
<code>(2005, 11, 16, 15, 11, 44, 2, 320, 0) => '2005-11-16 15:11:57'</code>
</dd>
<dt><b><code>convert_datetext_to_dategui(datetext, ln=cdslang)</code></b></dt>
<dd>
<code>'2005-11-16 15:11:57' => '16 nov 2005, 15:11'</code><br />
Month is internationalized
</dd>
<dt><b><code>convert_datetext_to_datestruct(datetext)</code></b></dt>
<dd>
<code>'2005-11-16 15:11:57' => (2005, 11, 16, 15, 11, 44, 2, 320, 0)</code>
</dd>
<dt><b><code>get_datestruct(year, month, day)</code></b></dt>
<dd>
<code>year=2005, month=11, day=16 => (2005, 11, 16, 0, 0, 0, 2, 320, -1)</code>
</dd>
<dt><b><code>get_datetext(year, month, day)</code></b></dt>
<dd>
<code>year=2005, month=11, day=16 => '2005-11-16 00:00:00'</code>
</dd>
</dl>
<h2>3. <a name="i18n">Internationalizing parts of dates</a></h2>
The following functions provide means of internationalizing part of dates.
<dl>
<dt>
<b><code>get_i18n_day_name(day_nb, display='short', ln=cdslang)</code></b>
</dt>
<dd>
get the string representation of a weekday, internationalized<br />
<code>
@param day_nb: number of weekday UNIX like. => 0=Sunday<br />
@param ln: language for output<br />
@return the string representation of the day
</code>
</dd>
<dt>
<b><code>get_i18n_month_name(month_nb, display='short', ln=cdslang)</code></b>
</dt>
<dd>
get a non-numeric representation of a month, internationalized.<br />
<code>
@param month_nb: number of month, (1 based!) => 1=jan,..,12=dec<br />
@param ln: language for output<br />
@return the string representation of month
</code>
</dd>
</dl>
<h2>4. <a name="generating">Generating GUI elements</a></h2>
The following functions create HTML fields for date selection:
<dl>
<dt>
<b><code>create_day_selectbox(name, selected_day=0, ln=cdslang)</code></b>
</dt>
<dd>Creates an HTML menu for day selection. (<code>0..31</code> values).<br />
<code>@param name: name of the control (i.e. name of the var you'll get)<br />
@param selected_day: preselect a day. Use 0 for the label 'Day'<br />
@param ln: language of the menu<br />
@return html as string
</code>
</dd>
<dt>
<b><code>create_month_selectbox(name, selected_month=0, ln=cdslang)</code></b>
</dt>
<dd>Creates an HTML menu for month selection. Value of selected field is numeric<br />
<code>@param name: name of the control (your form will be sent with name=value...)<br />
@param selected_month: preselect a month. use 0 for the Label 'Month'<br />
@param ln: language of the menu<br />
@return html as string
</code>
</dd>
<dt>
<b><code>create_year_inputbox(name, value=0)</code></b>
</dt>
<dd>
Creates an HTML field (simple input) for year selection.<br />
<code>@param name: name of the control (i.e. name of the variable you'll get)<br />
@param value: prefilled value (int)<br />
@return html as string
</code>
<dt>
<b><code>create_year_selectbox(name, from_year=-1, length=10, selected_year=0, ln=cdslang)</code></b>
</dt>
<dd>
Creates an HTML menu (dropdownbox) for year selection.<br />
<code>@param name: name of control( i.e. name of the variable you'll get)<br />
@param from_year: year on which to begin. if <0 assume it is current year<br />
@param length: number of items in menu<br />
@param selected_year: initial selected year (if in range), else: label is selected<br />
@param ln: language<br />
@return html as string
</code>
</dl>