From Xojo Documentation
| This item was deprecated in version 2019r2.
Please use DateTime.ToString as a replacement.
Reports the date in the user’s long date format as a string based on the user’s locale and formatting even if the user’s locale is a Unicode-only locale.
For example (US default format): Wednesday, December 31, 1997. The LongDate property uses the Long format on Windows and the Full format on Mac. Changing the user's system settings for these formats changes the format that the LongDate property uses.
The following example displays the current date in the LongDate format for the user’s operating system.