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  28  <H3><A NAME="9_8_4">9.8.4 Week scale</A></H3>
  29  <P> Week scales, if enabled, by default shows the week number in range 1
  30   to 53 (as defined by ISO-8601, see the reference section).</P>
  31  <P> It might be worth pointing out here that the week number calculation
  32   is carried out within JpGraph and does not rely on the underlying OS
  33   date libraries. This makes the behavior consistent over several OS:s
  34   (at least M$ Windows does<B> not</B> comply to ISO-8601 or supply any
  35   way of doing this through the normal libraries, e.g. strftime())</P>
  36  <P> You may modify the week behavior in three ways. You can specify
  37   (with SetStyle()) a different date format using the constants</P>
  38  <UL>
  39  <LI><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  40  &nbsp;WEEKSTYLE_WNBR</FONT></FONT></CODE></DIV>
  41  <P> Show week number To further modify the formatting of the actual week
  42   number you can optionally supply a format string with a call to<DIV class="phpscript">
  43  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;SetLabelFormatString</FONT><FONT
  44  color="#007700">()</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV>
  45  </P>
  46  <P> The format of the string should be a standard sprintf() syntax
  47   expecting an integer (the week number). By default a 'W' is prefixed to
  48   the number.</P>
  49  </LI>
  50  <LI><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  51  &nbsp;WEEKSTYLE_FIRSTDAY</FONT></FONT></CODE></DIV>
  52  <P> Show date of first day in week.</P>
  53  </LI>
  54  <LI><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  55  &nbsp;WEEKSTYLE_FIRSTDAY2</FONT></FONT></CODE></DIV>
  56  <P> Show date of first day in week and short month</P>
  57  </LI>
  58  <LI><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  59  &nbsp;WEEKSTYLE_FIRSTDAYWNBR</FONT></FONT></CODE></DIV>
  60  <P> Show weeknumber of first day in week.</P>
  61  </LI>
  62  <LI><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  63  &nbsp;WEEKSTYLE_FIRSTDAY2WNBR</FONT></FONT></CODE></DIV>
  64  <P> Show weeknumber of first day in week and month</P>
  65  </LI>
  66  </UL>
  67  <P></P>
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