Converts the specified date and time to a string.
Assembly: mscorlib (in mscorlib.dll)
Some cultures cannot convert future dates into strings. If the expiration date of an X.509 certificate is beyond the range of the culture, falls back to a calendar that can express the date. If the Calendar value is UmAlQuraCalendar, the calendar is changed to the HijriCalendar class; otherwise, it is changed to the InvariantCulture.