Perl / ExcelProgramming idea for the day! Instead of me trying to convince everyone to stop using bloody spreadsheet for everything, and use a system of mine instead, why not modify my systems to read a real excel spreadsheet! It's going to be impossible to conv... Perl and ExcelFound some handy documentation at <a href="http://www-106.ibm.com/developerworks/linux/library/l-pexcel/">IBM.com</a> of all places.Ongoing Excel / PERL stuffThe PERL Excel project is coming along nicely, it takes a long time to parse an Excel file, they're enormous... I've been working with a month's worth of gigs, just in partner venues in the UK, and that comes to about 1.1MB, so I opened it in Excel a... How to convert an Excel date to a UNIX dateExcel stores a date as the number of days since the start of 1900, and UNIX as the number of seconds since the start of 1970, so the sum is:<br /><br /><code>$unixTime = ( $excelDate - 25569 ) * 24 * 60 * 60;</code><br /><br />