Reset Date/Decimal Format Settings (Tools=>Reset date)
Choose this option to reset the date and decimal formats to comply with the International settings of your operating system.
Warning: On some systems this option has been known to "lock" up GSAK and hence the process can't be completed. If you run into this problem, you can change your date settings using the following work around:
1. Exit GSAK
2. Edit the file "gsak.ini" (found using "Tools=>GSAK folder finder" in the [application data] folder of GSAK), with any text editor - notepad will do.
The section to edit can be found here:
[FormatStrings]
ShortDateFormat=dd/MM/yyyy
DateSeparator=/
DecimalSeparator=.
Change the ShortDateFormat= to the required format.
Alternatively, just delete this section and GSAK should automatically pick up your computer date settings when you start it again.