The ConvertDateString method converts the specified string to a Date Variant, based on the specified locale. If successful, ConvertDateString returns the Date Variant containing the converted value; otherwise, Null.
Page.ConvertDateString(String, Locale)
Warning In some cases, the DataFunctions.ConvertDateString method returns NULL when converting a string representation of the Date to the Date VARIANT type for Latvian and Bulgarian locales. To avoid this problem, remove the constant string added at the end of the Date Represantion String according to the Regional Settings.