The actual decimal and thousand separators depend on your system regional settings and the current Settings > Locales menu selection.

Max. positive value: 1.7976931348623158e+308
Min. positive value: 2.2250738585072014e–308
Precision: up to 15 digits

Use the Edit > Convert commands to convert numbers to text strings, and vice versa.

When editing a cell you can force GS-Calc to treat the entered data as a text label by pressing and holding down the SHIFT key before pressing ENTER.

GS-Calc automatically converts text strings to numbers in formulas that require numeric arguments, however such text strings must represent unformatted numbers with a period (.) as a decimal separator. For example:
="1.5" + 1
is a valid formula but
="1,500.00" + 1
will return the #NUM! error.

Date/time/period values can be specified either as date/time serial numbers or as generic date/time/period strings.

A date/time serial number is a floating point value representing a date between January 1, 100 and December 31, 9999. The integer part of that value represents days and the fractional part represents the time of the day. The value 1.0 represents December 31, 1899. Negative numbers represent dates prior to December 30, 1899.

A generic date/time string is a string that conforms to the www.w3.org specification for date/time/period data types.

For more information about using date/time/period strings as an alternative for serial numbers please see the Formula Composer window and the included samples.

Note:To maintain maximum portability, you should date serial numbers as currently most of other spreadsheet applications use that method of date/time encoding.

A four-element 2x2 arrays:

{1, 2; "abc", "def"}

{1.00e+10; 2.00e+10; #N/A!; true}

Array elements can be unformatted numbers, text strings, Boolean values or error codes.

Generic (system-independent) GS-Calc settings activated with the Settings > Locales > Generic command require commas to separate columns (,) and semicolons (;) to separate rows.
If you choose to use the system regional settings and if your system requires commas to be used as decimal separators, use semicolons (;) to separate columns and backslashes (\) to separate rows.