diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index 1453f9b..eb5eebe 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -600,6 +600,10 @@ function booking_varietysessions_csv_report($timeslot_id) {
     $column_headings[] = array($heading => 'string');
   }
   
+ watchdog('booking_debug', "<pre>Variety session spreadsheet columns\n@info</pre>", 
+  array('@info' => print_r( $column_headings, true)));
+  
+
   // Calculate each row based on column headings
   for ($i = 0; $i < max($maximums); $i++) {
     $output = array();
diff --git a/libraries/xlsxwriter_plus.class.php b/libraries/xlsxwriter_plus.class.php
deleted file mode 100644
index 31a0978..0000000
--- a/libraries/xlsxwriter_plus.class.php
+++ /dev/null
@@ -1,651 +0,0 @@
-<?php
-/*
- * @license MIT License
- * */
-
-if (!class_exists('ZipArchive')) { throw new Exception('ZipArchive not found'); }
-
-Class XLSXWriter
-{
-	//------------------------------------------------------------------
-	protected $author ='Doc Author';
-
-	protected $defaultFontName = 'Calibri';
-	protected $defaultFontSize = 11;
-	protected $defaultWrapText = false;
-	protected $defaultVerticalAlign = 'top';
-	protected $defaultHorizontalAlign = 'left';
-	protected $defaultStartRow = 0;
-	protected $defaultStartCol = 0;
-
-	protected $defaultStyle = array();
-
-	protected $fontsCount = 1; //1 font must be in structure
-	protected $fontSize = 8;
-	protected $fontColor = '';
-	protected $fontStyles = '';
-	protected $fontName = '';
-	protected $fontId = 0; //font counting from index - 0, means 0,1 - 2 elements
-
-	protected $bordersCount = 1; //1 border must be in structure
-	protected $bordersStyle = '';
-	protected $bordersColor = '';
-	protected $borderId = 0; //borders counting from index - 0, means 0,1 - 2 elements
-
-	protected $fillsCount = 2; //2 fills must be in structure
-	protected $fillColor = '';
-	protected $fillId = 1; //fill counting from index - 0, means 0,1 - 2 elements
-
-	protected $stylesCount = 1;//1 style must be in structure
-
-	protected $sheets_meta = array();
-	protected $shared_strings = array();//unique set
-	protected $shared_string_count = 0;//count of non-unique references to the unique set
-	protected $temp_files = array();
-
-	public function __construct(){}
-	public function setAuthor($author='') { $this->author=$author; }
-	public function setFontName($defaultFontName) { $this->defaultFontName=$defaultFontName; }
-	public function setFontSize($defaultFontSize) { $this->defaultFontSize=$defaultFontSize; }
-	public function setWrapText($defaultWrapText) { $this->defaultWrapText=$defaultWrapText; }
-	public function setVerticalAlign($defaultVerticalAlign) { $this->defaultVerticalAlign=$defaultVerticalAlign; }
-	public function setHorizontalAlign($defaultHorizontalAlign) { $this->defaultHorizontalAlign=$defaultHorizontalAlign; }
-	private function setStyle($defaultStyle) { $this->defaultStyle=$defaultStyle; }
-	public function setStartRow($defaultStartRow) { $this->defaultStartRow=($defaultStartRow > 0) ? ((int)$defaultStartRow - 1) : 0; }
-	public function setStartCol($defaultStartCol) { $this->defaultStartCol=($defaultStartCol > 0) ? ((int)$defaultStartCol - 1) : 0; }
-
-	public function __destruct()
-	{
-		if (!empty($this->temp_files)) {
-			foreach($this->temp_files as $temp_file) {
-				@unlink($temp_file);
-			}
-		}
-	}
-	
-	protected function tempFilename()
-	{
-		$filename = tempnam("/tmp", "xlsx_writer_");
-		$this->temp_files[] = $filename;
-		return $filename;
-	}
-
-	public function writeToStdOut()
-	{
-		$temp_file = $this->tempFilename();
-		self::writeToFile($temp_file);
-		readfile($temp_file);
-	}
-
-	public function writeToString()
-	{
-		$temp_file = $this->tempFilename();
-		self::writeToFile($temp_file);
-		$string = file_get_contents($temp_file);
-		return $string;
-	}
-
-	public function sanitize_filename($filename) //http://msdn.microsoft.com/en-us/library/aa365247%28VS.85%29.aspx
-	{
-		$nonprinting = array_map('chr', range(0,31));
-		$invalid_chars = array('<', '>', '?', '"', ':', '|', '\\', '/', '*', '&');
-		$all_invalids = array_merge($nonprinting,$invalid_chars);
-		return str_replace($all_invalids, "", $filename);
-	}
-	//------------------------------------------------------------------
-	public function sanitize_sheetname($sheetname) 
-	{
-		static $badchars  = '\\/?*:[]';
-		static $goodchars = '        ';
-		$sheetname = strtr($sheetname, $badchars, $goodchars);
-		$sheetname = substr($sheetname, 0, 31);
-		$sheetname = trim(trim(trim($sheetname),"'"));//trim before and after trimming single quotes
-		return !empty($sheetname) ? $sheetname : 'Sheet'.((rand()%900)+100);
-	}	
-
-	public function writeToFile($filename)
-	{
-		@unlink($filename);//if the zip already exists, overwrite it
-		$zip = new ZipArchive();
-		if (empty($this->sheets_meta))                  { self::log("Error in ".__CLASS__."::".__FUNCTION__.", no worksheets defined."); return; }
-		if (!$zip->open($filename, ZipArchive::CREATE)) { self::log("Error in ".__CLASS__."::".__FUNCTION__.", unable to create zip."); return; }
-		
-		$zip->addEmptyDir("docProps/");
-		$zip->addFromString("docProps/app.xml" , self::buildAppXML() );
-		$zip->addFromString("docProps/core.xml", self::buildCoreXML());
-
-		$zip->addEmptyDir("_rels/");
-		$zip->addFromString("_rels/.rels", self::buildRelationshipsXML());
-
-		$zip->addEmptyDir("xl/worksheets/");
-		foreach($this->sheets_meta as $sheet_meta) {
-			$zip->addFile($sheet_meta['filename'], "xl/worksheets/".$sheet_meta['xmlname'] );
-		}
-		if (!empty($this->shared_strings)) {
-			$zip->addFile($this->writeSharedStringsXML(), "xl/sharedStrings.xml" );  //$zip->addFromString("xl/sharedStrings.xml",     self::buildSharedStringsXML() );
-		}
-		$zip->addFromString("xl/workbook.xml"         , self::buildWorkbookXML() );
-		$zip->addFile($this->writeStylesXML(), "xl/styles.xml" );  //$zip->addFromString("xl/styles.xml"           , self::buildStylesXML() );
-		$zip->addFromString("[Content_Types].xml"     , self::buildContentTypesXML() );
-
-		$zip->addEmptyDir("xl/_rels/");
-		$zip->addFromString("xl/_rels/workbook.xml.rels", self::buildWorkbookRelsXML() );
-		$zip->close();
-	}
-
-	
-	public function writeSheet(array $data, $sheet_name='', array $header_types=array(), array $styles )
-	{
-		for ($i = 0; $i < count($styles); $i++) {
-			$styles[$i] += array('sheet' => $sheet_name);
-		}
-		$this->setStyle(array_merge((array)$this->defaultStyle, (array)$styles));
-
-		$data = empty($data) ? array( array('') ) : $data;
-
-		$sheet_filename = $this->tempFilename();
-		$sheet_default = 'Sheet'.(count($this->sheets_meta)+1);
-		$sheet_name = !empty($sheet_name) ? $sheet_name : $sheet_default;
-		$this->sheets_meta[] = array('filename'=>$sheet_filename, 'sheetname'=>$sheet_name ,'xmlname'=>strtolower($sheet_default).".xml" );
-
-		$header_offset = empty($header_types) ? 0 : $this->defaultStartRow + 1;
-		$row_count = count($data) + $header_offset;
-		$column_count = count($data[self::array_first_key($data)]);
-		$max_cell = self::xlsCell( $row_count-1, $column_count-1 );
-
-		$tabselected = count($this->sheets_meta)==1 ? 'true' : 'false';//only first sheet is selected
-		$cell_formats_arr = empty($header_types) ? array_fill(0, $column_count, 'string') : array_values($header_types);
-		$header_row = empty($header_types) ? array() : array_keys($header_types);
-
-		$fd = fopen($sheet_filename, "w+");
-		if ($fd===false) { self::log("write failed in ".__CLASS__."::".__FUNCTION__."."); return; }
-		
-		fwrite($fd,'<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n");
-		fwrite($fd,'<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">');
-		fwrite($fd,    '<sheetPr filterMode="false">');
-		fwrite($fd,        '<pageSetUpPr fitToPage="false"/>');
-		fwrite($fd,    '</sheetPr>');
-		fwrite($fd,    '<dimension ref="A1:'.$max_cell.'"/>');
-		fwrite($fd,    '<sheetViews>');
-		fwrite($fd,        '<sheetView colorId="64" defaultGridColor="true" rightToLeft="false" showFormulas="false" showGridLines="true" showOutlineSymbols="true" showRowColHeaders="true" showZeros="true" tabSelected="'.$tabselected.'" topLeftCell="A1" view="normal" windowProtection="false" workbookViewId="0" zoomScale="100" zoomScaleNormal="100" zoomScalePageLayoutView="100">');
-		fwrite($fd,            '<selection activeCell="A1" activeCellId="0" pane="topLeft" sqref="A1"/>');
-		fwrite($fd,        '</sheetView>');
-		fwrite($fd,    '</sheetViews>');
-		fwrite($fd,    '<cols>');
-		fwrite($fd,        '<col collapsed="false" hidden="false" max="1025" min="1" style="0" width="11.5"/>');
-		fwrite($fd,    '</cols>');
-		fwrite($fd,    '<sheetData>');
-		if (!empty($header_row))
-		{
-			fwrite($fd, '<row collapsed="false" customFormat="false" customHeight="false" hidden="false" ht="12.1" outlineLevel="0" r="'.($this->defaultStartRow + 1).'">');
-			foreach($header_row as $k=>$v)
-			{
-				$this->writeCell($fd, $this->defaultStartRow + 0, $this->defaultStartCol + $k, $v, $sheet_name);
-			}
-			fwrite($fd, '</row>');
-		}
-		foreach($data as $i=>$row)
-		{
-			fwrite($fd, '<row collapsed="false" customFormat="false" customHeight="false" hidden="false" ht="12.1" outlineLevel="0" r="'.($i+$header_offset+1).'">');
-			foreach($row as $k=>$v)
-			{
-				$this->writeCell($fd, $i+$header_offset, $this->defaultStartCol + $k, $v, $sheet_name);
-			}
-			fwrite($fd, '</row>');
-		}
-		fwrite($fd,    '</sheetData>');
-		fwrite($fd,    '<printOptions headings="false" gridLines="false" gridLinesSet="true" horizontalCentered="false" verticalCentered="false"/>');
-		fwrite($fd,    '<pageMargins left="0.5" right="0.5" top="1.0" bottom="1.0" header="0.5" footer="0.5"/>');
-		fwrite($fd,    '<pageSetup blackAndWhite="false" cellComments="none" copies="1" draft="false" firstPageNumber="1" fitToHeight="1" fitToWidth="1" horizontalDpi="300" orientation="portrait" pageOrder="downThenOver" paperSize="1" scale="100" useFirstPageNumber="true" usePrinterDefaults="false" verticalDpi="300"/>');
-		fwrite($fd,    '<headerFooter differentFirst="false" differentOddEven="false">');
-		fwrite($fd,        '<oddHeader>&amp;C&amp;&quot;Times New Roman,Regular&quot;&amp;12&amp;A</oddHeader>');
-		fwrite($fd,        '<oddFooter>&amp;C&amp;&quot;Times New Roman,Regular&quot;&amp;12Page &amp;P</oddFooter>');
-		fwrite($fd,    '</headerFooter>');
-		fwrite($fd,'</worksheet>');
-		fclose($fd);
-	}
-
-	protected function writeCell($fd, $row_number, $column_number, $value, $sheet_name)
-	{
-		$cell = self::xlsCell($row_number, $column_number);
-		$s = '0';
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $key => $style) {
-				if (isset($style['sheet'])) {
-					if ($style['sheet'] == $sheet_name) {
-						if (isset($style['allfilleddata'])) {
-							$s = $key + 1;
-						} else {
-							if (isset($style['columns'])) {
-								if (is_array($style['columns'])) {
-									if (in_array($column_number, $style['columns'])) $s = $key + 1;
-								} else {
-									if ($column_number == $style['columns']) $s = $key + 1;
-								}
-							} elseif (isset($style['rows'])) {
-								if (is_array($style['rows'])) {
-									if (in_array($row_number, $style['rows'])) $s = $key + 1;
-								} else {
-									if ($row_number == $style['rows']) $s = $key + 1;
-								}
-							} elseif (isset($style['cells'])) {
-								if (is_array($style['cells'])) {
-									if (in_array($cell, $style['cells'])) $s = $key + 1;
-								} else {
-									if ($cell == $style['cells']) $s = $key + 1;
-								}
-							}
-						}
-					}
-				}
-			}
-		}
-		if (is_numeric($value)) {
-			fwrite($fd,'<c r="'.$cell.'" s="'.$s.'" t="n"><v>'.($value*1).'</v></c>');//int,float, etc
-		} else if ($cell_format=='date') {
-			fwrite($fd,'<c r="'.$cell.'" s="'.$s.'" t="n"><v>'.intval(self::convert_date_time($value)).'</v></c>');
-		} else if ($cell_format=='datetime') {
-			fwrite($fd,'<c r="'.$cell.'" s="'.$s.'" t="n"><v>'.self::convert_date_time($value).'</v></c>');
-		} else if ($value==''){
-			fwrite($fd,'<c r="'.$cell.'" s="'.$s.'"/>');
-		} else if ($value{0}=='='){
-			fwrite($fd,'<c r="'.$cell.'" s="'.$s.'" t="s"><f>'.self::xmlspecialchars($value).'</f></c>');
-		} else if ($value!==''){
-			fwrite($fd,'<c r="'.$cell.'" s="'.$s.'" t="s"><v>'.self::xmlspecialchars($this->setSharedString($value)).'</v></c>');
-		}
-	}
-
-	protected function writeStylesXML()
-	{
-		$tempfile = $this->tempFilename();
-		$fd = fopen($tempfile, "w+");
-		if ($fd===false) { self::log("write failed in ".__CLASS__."::".__FUNCTION__."."); return; }
-		fwrite($fd, '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n");
-		fwrite($fd, '<styleSheet xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" mc:Ignorable="x14ac" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['font'])) $this->fontsCount++;
-				}
-			}
-		}
-		fwrite($fd, '<fonts x14ac:knownFonts="1" count="'.$this->fontsCount.'">');
-		fwrite($fd, '	<font>');
-		fwrite($fd, '		<sz val="'.$this->defaultFontSize.'"/>');
-		fwrite($fd, '		<color theme="1"/>');
-		fwrite($fd, '		<name val="'.$this->defaultFontName.'"/>');
-		fwrite($fd, '		<family val="2"/>');
-		if ($this->defaultFontName == 'MS Sans Serif') {
-			fwrite($fd, '		<charset val="204"/>');
-		} else if ($this->defaultFontName == 'Calibri') {
-			fwrite($fd, '		<scheme val="minor"/>');
-		} else {
-			fwrite($fd, '		<charset val="204"/>');
-		}
-		fwrite($fd, '	</font>');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['font'])) {
-						if (isset($style['font']['name'])) $this->fontName = $style['font']['name'];
-						if (isset($style['font']['size'])) $this->fontSize = $style['font']['size'];
-						if (isset($style['font']['color'])) $this->fontColor = $style['font']['color'];
-						if ($style['font']['bold']) $this->fontStyles .= '<b/>';
-						if ($style['font']['italic']) $this->fontStyles .= '<i/>';
-						if ($style['font']['underline']) $this->fontStyles .= '<u/>';
-
-						fwrite($fd, '	<font>');
-						if ($this->fontStyles) fwrite($fd, '		'.$this->fontStyles);
-						fwrite($fd, '		<sz val="'.$this->fontSize.'"/>');
-						if ($this->fontColor) {
-							fwrite($fd, '		<color rgb="FF'.$this->fontColor.'"/>');
-						} else {
-							fwrite($fd, '		<color theme="1"/>');
-						}
-						fwrite($fd, '		<name val="'.$this->fontName.'"/>');
-						fwrite($fd, '		<fasmily val="2"/>');
-						if ($this->fontName == 'MS Sans Serif') {
-							fwrite($fd, '		<charset val="204"/>');
-						} else if ($this->fontName == 'Calibri') {
-							fwrite($fd, '		<scheme val="minor"/>');
-						} else {
-							fwrite($fd, '		<charset val="204"/>');
-						}
-						fwrite($fd, '	</font>');
-					}
-					$this->fontStyles = '';
-				}
-			}
-		}
-		fwrite($fd, '</fonts>');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['fill'])) $this->fillsCount++;
-				}
-			}
-		}
-		fwrite($fd, '<fills count="'.$this->fillsCount.'">');
-		fwrite($fd, '	<fill><patternFill patternType="none"/></fill>');
-		fwrite($fd, '	<fill><patternFill patternType="gray125"/></fill>');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['fill'])) {
-						if (isset($style['fill']['color'])) $this->fillColor = $style['fill']['color'];
-						fwrite($fd, '	<fill>');
-						fwrite($fd, '		<patternFill patternType="solid">');
-						fwrite($fd, '			<fgColor rgb="FF'.$this->fillColor.'"/>');
-						fwrite($fd, '			<bgColor indexed="64"/>');
-						fwrite($fd, '		</patternFill>');
-						fwrite($fd, '	</fill>');
-					}
-				}
-			}
-		}
-		fwrite($fd, '</fills>');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['border'])) $this->bordersCount++;
-				}
-			}
-		}
-		fwrite($fd, '<borders count="'.$this->bordersCount.'">');
-		fwrite($fd, '	<border>');
-		fwrite($fd, '		<left/><right/><top/><bottom/><diagonal/>');
-		fwrite($fd, '	</border>');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['border'])) {
-						if (isset($style['border']['style'])) $this->bordersStyle = ' style="'.$style['border']['style'].'"';
-						if (isset($style['border']['color'])) $this->bordersColor = '<color rgb="FF'.$style['border']['color'].'"/>';
-						fwrite($fd, '	<border>');
-						fwrite($fd, '		<left'.$this->bordersStyle.'>'.$this->bordersColor.'</left>');
-						fwrite($fd, '		<right'.$this->bordersStyle.'>'.$this->bordersColor.'</right>');
-						fwrite($fd, '		<top'.$this->bordersStyle.'>'.$this->bordersColor.'</top>');
-						fwrite($fd, '		<bottom'.$this->bordersStyle.'>'.$this->bordersColor.'</bottom>');
-						fwrite($fd, '		<diagonal/>');
-						fwrite($fd, '	</border>');
-					}
-				}
-			}
-		}
-		fwrite($fd, '</borders>');
-		fwrite($fd, 	'<cellStyleXfs count="1">');
-		fwrite($fd,		'<xf borderId="0" fillId="0" fontId="0" numFmtId="0"/>');
-		fwrite($fd, 	'</cellStyleXfs>');
-		$this->stylesCount += count($this->defaultStyle);
-		fwrite($fd, 	'<cellXfs count="'.$this->stylesCount.'">');
- 		$this->defaultWrapText = ($this->defaultWrapText) ? '1' : '0';
-		fwrite($fd, 		'<xf borderId="0" fillId="0" fontId="0" numFmtId="0" xfId="0"><alignment wrapText="'.$this->defaultWrapText.'" vertical="'.$this->defaultVerticalAlign.'" horizontal="'.$this->defaultHorizontalAlign.'"/></xf>');
-		if ($this->defaultStyle) {
-			foreach ($this->defaultStyle as $style) {
-				if (isset($style['sheet'])) {
-					if (isset($style['font'])) {
-						$font_Id = $this->fontId += 1;
-					} else {
-						$font_Id = 0;
-					}
-					if (isset($style['fill'])) {
-						$fill_Id = $this->fillId += 1;
-					} else {
-						$fill_Id = 0;
-					}
-					if (isset($style['border'])) {
-						$border_Id = $this->borderId += 1;
-					} else {
-						$border_Id = 0;
-					}
-					if (isset($style['wrapText'])) {
-						$wrapText = ($style['wrapText']) ? '1' : '0';
-					} else {
-						$wrapText = $this->defaultWrapText;
-					}
-
-					$format_Id = (isset($style['format'])) ? $style['format'] : '0';
-
-					if (isset($style['verticalAlign'])) {
-						$verticalAlign = $style['verticalAlign'];
-					} else {
-						$verticalAlign = $this->defaultVerticalAlign;
-					}
-					if (isset($style['horizontalAlign'])) {
-						$horizontalAlign = $style['horizontalAlign'];
-					} else {
-						$horizontalAlign = $this->defaultHorizontalAlign;
-					}
-					fwrite($fd, 		'<xf borderId="'.$border_Id.'" fillId="'.$fill_Id.'" fontId="'.$font_Id.'" numFmtId="'.$format_Id.'" xfId="0" applyFill="1">');
-					fwrite($fd, 			'<alignment wrapText="'.$wrapText.'" vertical="'.$verticalAlign.'" horizontal="'.$horizontalAlign.'"/>');
-					fwrite($fd, 		'</xf>');
-				}
-			}
-		}
-		fwrite($fd, 	'</cellXfs>');
-		fwrite($fd, 	'<cellStyles count="1">');
-		fwrite($fd, 		'<cellStyle xfId="0" builtinId="0" name="Normal"/>');
-		fwrite($fd, 	'</cellStyles>');
-		fwrite($fd, 	'<dxfs count="0"/>');
-		fwrite($fd, 	'<tableStyles count="0" defaultPivotStyle="PivotStyleMedium9" defaultTableStyle="TableStyleMedium2"/>');
-		fwrite($fd, 	'<extLst>');
-		fwrite($fd, 	'<ext xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" uri="{EB79DEF2-80B8-43e5-95BD-54CBDDF9020C}">');
-		fwrite($fd, 		'<x14:slicerStyles defaultSlicerStyle="SlicerStyleLight1"/>');
-		fwrite($fd, 	'</ext>');
-		fwrite($fd, 	'</extLst>');
-		fwrite($fd, '</styleSheet>');
-		fclose($fd);
-		return $tempfile;
-	}
-
-	protected function setSharedString($v)
-	{
-		if (isset($this->shared_strings[$v]))
-		{
-			$string_value = $this->shared_strings[$v];
-		}
-		else
-		{
-			$string_value = count($this->shared_strings);
-			$this->shared_strings[$v] = $string_value;
-		}
-		$this->shared_string_count++;//non-unique count
-		return $string_value;
-	}
-
-	protected function writeSharedStringsXML()
-	{
-		$tempfile = $this->tempFilename();
-		$fd = fopen($tempfile, "w+");
-		if ($fd===false) { self::log("write failed in ".__CLASS__."::".__FUNCTION__."."); return; }
-		
-		fwrite($fd,'<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n");
-		fwrite($fd,'<sst count="'.($this->shared_string_count).'" uniqueCount="'.count($this->shared_strings).'" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">');
-		foreach($this->shared_strings as $s=>$c)
-		{
-			fwrite($fd,'<si><t>'.self::xmlspecialchars($s).'</t></si>');
-		}
-		fwrite($fd, '</sst>');
-		fclose($fd);
-		return $tempfile;
-	}
-
-	protected function buildAppXML()
-	{
-		$app_xml="";
-		$app_xml.='<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n";
-		$app_xml.='<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties" xmlns:vt="http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"><TotalTime>0</TotalTime></Properties>';
-		return $app_xml;
-	}
-
-	protected function buildCoreXML()
-	{
-		$core_xml="";
-		$core_xml.='<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n";
-		$core_xml.='<cp:coreProperties xmlns:cp="http://schemas.openxmlformats.org/package/2006/metadata/core-properties" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcmitype="http://purl.org/dc/dcmitype/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">';
-		$core_xml.='<dcterms:created xsi:type="dcterms:W3CDTF">'.date("Y-m-d\TH:i:s.00\Z").'</dcterms:created>';//$date_time = '2013-07-25T15:54:37.00Z';
-		$core_xml.='<dc:creator>'.self::xmlspecialchars($this->author).'</dc:creator>';
-		$core_xml.='<cp:revision>0</cp:revision>';
-		$core_xml.='</cp:coreProperties>';
-		return $core_xml;
-	}
-
-	protected function buildRelationshipsXML()
-	{
-		$rels_xml="";
-		$rels_xml.='<?xml version="1.0" encoding="UTF-8"?>'."\n";
-		$rels_xml.='<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">';
-		$rels_xml.='<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/>';
-		$rels_xml.='<Relationship Id="rId2" Type="http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties" Target="docProps/core.xml"/>';
-		$rels_xml.='<Relationship Id="rId3" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties" Target="docProps/app.xml"/>';
-		$rels_xml.="\n";
-		$rels_xml.='</Relationships>';
-		return $rels_xml;
-	}
-
-	protected function buildWorkbookXML()
-	{
-		$workbook_xml="";
-		$workbook_xml.='<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'."\n";
-		$workbook_xml.='<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">';
-		$workbook_xml.='<fileVersion appName="Calc"/><workbookPr backupFile="false" showObjects="all" date1904="false"/><workbookProtection/>';
-		$workbook_xml.='<bookViews><workbookView activeTab="0" firstSheet="0" showHorizontalScroll="true" showSheetTabs="true" showVerticalScroll="true" tabRatio="212" windowHeight="8192" windowWidth="16384" xWindow="0" yWindow="0"/></bookViews>';
-		$workbook_xml.='<sheets>';
-		foreach($this->sheets_meta as $i=>$sheet_meta) {
-			$workbook_xml.='<sheet name="'.self::xmlspecialchars($sheet_meta['sheetname']).'" sheetId="'.($i+1).'" state="visible" r:id="rId'.($i+2).'"/>';
-		}
-		$workbook_xml.='</sheets>';
-		$workbook_xml.='<calcPr iterateCount="100" refMode="A1" iterate="false" iterateDelta="0.001"/></workbook>';
-		return $workbook_xml;
-	}
-
-	protected function buildWorkbookRelsXML()
-	{
-		$wkbkrels_xml="";
-		$wkbkrels_xml.='<?xml version="1.0" encoding="UTF-8"?>'."\n";
-		$wkbkrels_xml.='<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">';
-		$wkbkrels_xml.='<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles" Target="styles.xml"/>';
-		foreach($this->sheets_meta as $i=>$sheet_meta) {
-			$wkbkrels_xml.='<Relationship Id="rId'.($i+2).'" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/'.($sheet_meta['xmlname']).'"/>';
-		}
-		if (!empty($this->shared_strings)) {
-			$wkbkrels_xml.='<Relationship Id="rId'.(count($this->sheets_meta)+2).'" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings" Target="sharedStrings.xml"/>';
-		}
-		$wkbkrels_xml.="\n";
-		$wkbkrels_xml.='</Relationships>';
-		return $wkbkrels_xml;
-	}
-
-	protected function buildContentTypesXML()
-	{
-		$content_types_xml="";
-		$content_types_xml.='<?xml version="1.0" encoding="UTF-8"?>'."\n";
-		$content_types_xml.='<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">';
-		$content_types_xml.='<Override PartName="/_rels/.rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>';
-		$content_types_xml.='<Override PartName="/xl/_rels/workbook.xml.rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>';
-		foreach($this->sheets_meta as $i=>$sheet_meta) {
-			$content_types_xml.='<Override PartName="/xl/worksheets/'.($sheet_meta['xmlname']).'" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>';
-		}
-		if (!empty($this->shared_strings)) {
-			$content_types_xml.='<Override PartName="/xl/sharedStrings.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sharedStrings+xml"/>';
-		}
-		$content_types_xml.='<Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>';
-		$content_types_xml.='<Override PartName="/xl/styles.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml"/>';
-		$content_types_xml.='<Override PartName="/docProps/app.xml" ContentType="application/vnd.openxmlformats-officedocument.extended-properties+xml"/>';
-		$content_types_xml.='<Override PartName="/docProps/core.xml" ContentType="application/vnd.openxmlformats-package.core-properties+xml"/>';
-		$content_types_xml.="\n";
-		$content_types_xml.='</Types>';
-		return $content_types_xml;
-	}
-
-	//------------------------------------------------------------------
-	/*
-	 * @param $row_number int, zero based
-	 * @param $column_number int, zero based
-	 * @return Cell label/coordinates, ex: A1, C3, AA42
-	 * */
-	public static function xlsCell($row_number, $column_number)
-	{
-		$n = $column_number;
-		for($r = ""; $n >= 0; $n = intval($n / 26) - 1) {
-			$r = chr($n%26 + 0x41) . $r;
-		}
-		return $r . ($row_number+1);
-	}
-	//------------------------------------------------------------------
-	public static function log($string)
-	{
-		file_put_contents("php://stderr", date("Y-m-d H:i:s:").rtrim(is_array($string) ? json_encode($string) : $string)."\n");
-	}
-	//------------------------------------------------------------------
-	public static function xmlspecialchars($val)
-	{
-		return str_replace("'", "&#39;", htmlspecialchars($val));
-	}
-	//------------------------------------------------------------------
-	public static function array_first_key(array $arr)
-	{
-		reset($arr);
-		$first_key = key($arr);
-		return $first_key;
-	}
-	//------------------------------------------------------------------
-	public static function convert_date_time($date_input) //thanks to Excel::Writer::XLSX::Worksheet.pm (perl)
-	{
-		$days    = 0;    # Number of days since epoch
-		$seconds = 0;    # Time expressed as fraction of 24h hours in seconds
-		$year=$month=$day=0;
-		$hour=$min  =$sec=0;
-
-		$date_time = $date_input;
-		if (preg_match("/(\d{4})\-(\d{2})\-(\d{2})/", $date_time, $matches))
-		{
-			list($junk,$year,$month,$day) = $matches;
-		}
-		if (preg_match("/(\d{2}):(\d{2}):(\d{2})/", $date_time, $matches))
-		{
-			list($junk,$hour,$min,$sec) = $matches;
-			$seconds = ( $hour * 60 * 60 + $min * 60 + $sec ) / ( 24 * 60 * 60 );
-		}
-
-		//using 1900 as epoch, not 1904, ignoring 1904 special case
-		
-		# Special cases for Excel.
-		if ("$year-$month-$day"=='1899-12-31')  return $seconds      ;    # Excel 1900 epoch
-		if ("$year-$month-$day"=='1900-01-00')  return $seconds      ;    # Excel 1900 epoch
-		if ("$year-$month-$day"=='1900-02-29')  return 60 + $seconds ;    # Excel false leapday
-
-		# We calculate the date by calculating the number of days since the epoch
-		# and adjust for the number of leap days. We calculate the number of leap
-		# days by normalising the year in relation to the epoch. Thus the year 2000
-		# becomes 100 for 4 and 100 year leapdays and 400 for 400 year leapdays.
-		$epoch  = 1900;
-		$offset = 0;
-		$norm   = 300;
-		$range  = $year - $epoch;
-
-		# Set month days and check for leap year.
-		$leap = (($year % 400 == 0) || (($year % 4 == 0) && ($year % 100)) ) ? 1 : 0;
-		$mdays = array( 31, ($leap ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 );
-
-		# Some boundary checks
-		if($year < $epoch || $year > 9999) return 0;
-		if($month < 1     || $month > 12)  return 0;
-		if($day < 1       || $day > $mdays[ $month - 1 ]) return 0;
-
-		# Accumulate the number of days since the epoch.
-		$days = $day;    # Add days for current month
-		$days += array_sum( array_slice($mdays, 0, $month-1 ) );    # Add days for past months
-		$days += $range * 365;                      # Add days for past years
-		$days += intval( ( $range ) / 4 );             # Add leapdays
-		$days -= intval( ( $range + $offset ) / 100 ); # Subtract 100 year leapdays
-		$days += intval( ( $range + $offset + $norm ) / 400 );  # Add 400 year leapdays
-		$days -= $leap;                                      # Already counted above
-
-		# Adjust for Excel erroneously treating 1900 as a leap year.
-		if ($days > 59) { $days++;}
-
-		return $days + $seconds;
-	}
-	//------------------------------------------------------------------
-}
\ No newline at end of file