void Format::setNumFormat (
Sets the numeric format. It can be date, time, currency, etc... The following table lists possible values for $num_format and the corresponding types that a numeric format expects as arguments.
|0||Decimal||The amount of zeros specifies the amount of digits that will be shown|
|0.00||Decimal||The amount of zeros after the decimal dot specifies the amount of decimal digits that will be shown|
|#.##||Decimal||The amount of sharp signs after the decimal dot specifies the maximum amount of decimal digits that will be shown|
|0%||Percent||The amount of zeros specifies the amount of digits that will be shown.|
|0.000%||Percent||The amount of zeros after the decimal dot specifies the amount of decimal digits that will be shown.|
|$#.#;[Red]($#.#)||Currency||Zeros and sharp signs have the same meaning as in other formats.|
|??/??||Fraction||The amount of question signs in the denominator determines its precision (maximum amount of digits in the denominator).|
|# ??/??||Fraction||A fraction with an integer part. Zeros and sharp signs are used for defining the integer part, and they have the same meaning as in other formats.|
|0.00E+#||Scientific||In scientific notation base and exponent are formated according to the same rules applied to decimals. For scientific notation zeros and sharp signs appear to be equivalent.|
|D-MMM-YY||Date||A date represented in the given notation. Month can be a one or two digits month, or a three letter month. Year can have 2 or 4 digits. The argument to be formated as a date is considered to be the number of days since December 30 1899 (Excel's day zero). For dates preceding day zero, negative numbers can be used.|
|D/M/YYYY h:mm:ss||Date/Time||A date represented in the given notation. The argument to be formated as a date is considered to be the number of days since Excel's day zero.|
|h:mm:ss AM/PM||Time||A time represented in the given notation. Be careful, the argument to be formated as a time has to be given in days. For example an argument of 0.5 would be presented as '12:00:00 PM'.|
The information here presented comes from OpenOffice.org's Documentation of the Microsoft Excel File Format (http://sc.openoffice.org/excelfileformat.pdf).
string $num_format - The numeric format.
This function can not be called statically.
$workbook = new Spreadsheet_Excel_Writer();
$worksheet =& $workbook->addWorksheet();
// We'll show dates with a three letter month and four digit year format
$date_format =& $workbook->addFormat();
// number of seconds in a day
$seconds_in_a_day = 86400;
// Unix timestamp to Excel date difference in seconds
$ut_to_ed_diff = $seconds_in_a_day * 25569;
// show Excel's day zero date
$worksheet->write(0, 0, "Excel's day zero");
$worksheet->write(0, 1, 0, $date_format);
// show today's date
$now = time();
$worksheet->write(1, 0, "Today's date:");
$worksheet->write(1, 1, ($now + $ut_to_ed_diff) / $seconds_in_a_day, $date_format);