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Use this JavaScript to figure out when Sunday will be in a given point of time.

Label: Calculator for Sunday

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<script language="JavaScript">
<!-- Begin
function WeekStart(Month, Year, StartOfWeekDay) {
  _Date = new Date(Year, Month, 1)
  _LastDate = new Date()
  _LastDate = new Date(_Date)
  _LastDate.setMonth(_Date.getMonth() + 1)
  _LastDate.setHours(_LastDate.getHours() - 24)
  _Returns = new Array()
  if (StartOfWeekDay == null) {
    StartOfWeekDay = 0
  }
  var I = 1
  while (I <= _LastDate.getDate()) {
    _Date.setDate(I)
    if (_Date.getDay() == StartOfWeekDay) {
      _Returns[_Returns.length] = new Date(_Date)
      I += 6
    }
    I++
  }
  return(_Returns)
}
//  End -->
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<form>Month <select name="Month"><option value="0">Jan
</option><option value="1">Feb
</option><option value="2">Mar
</option><option value="3">Apr
</option><option value="4">May
</option><option value="5">Jun
</option><option value="6">Jul
</option><option value="7">Aug
</option><option value="8">Sep
</option><option value="9">Oct
</option><option value="10">Nov
</option><option value="11">Dec

</option></select><br>
Year <input type="text" name="Year" size="4" maxlength="4"><br>
<input type="button" value="Get Days" onclick="alert(WeekStart(document.forms[0].Month.value, document.forms[0].Year.value, 0))">
</form>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->