6401: You must enter a valid date. The month must be 1-12, the day must be a valid day of the month, and the year may not be earlier than 1753.

March 12, 2004 | KB: 90065

https://support.laserfiche.com/kb/90065/6401-you-must-enter-a-valid-date-the-month-must-be-1-12-the-day-must-be-a-valid-day-of-the-month-and-the-year-may-not-be-earlier-than-1753-

Laserfiche 6, Plus 6

Only valid dates that occur on or after 1753 can be stored in a date field.

A workaround for this issue is to specify a valid date (as determined above) using short date format (i.e. 10/15/2002).

Note: The order in which days, months, and years should appear in the date format will depend upon the system date configuration for the current workstation.