[excel_date]

Description

MS Excel uses a numeric format, called Serial Date format, when storing and dealing with dates and times. Serial date is calculated by taking a given date and determining the number of days that have passed since that date and 01-Jan-1900 (actually 00-Jan1900, but don't ask me, I don't know nothing about this).

Sample Usage

//convert a serial date integer from an excel file to a lasso date
date_format(excel2lasso_Date(40617),-format='%d/%m/%Y');

//convert a lasso date for inclusion in an excel file
lasso2excel_Date(date('2011-03-15'));

Source Code

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define_tag('excel2lasso_date', -required='s',-type='integer');
	local('t') = date('1900-01-01');
	local('d') = integer(#s - 2);
	local('result') = date(date_add(#t,-day=#d));
	return(#result);
/define_tag;

define_tag('lasso2excel_date', -required='d',-type='date');
	local('s') = date_difference(#d,'1900-01-01',-day);
	local('result') = integer(#s + 2);
	return(#result);
/define_tag;

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