Date adjusts 100 years back after 2049

We are copying excel data into Smartsheet and the dates form 2049 forward revert back to 1949. We have adjust regional settings on the PC so Excel will not revert a date back to the 1900's until we get to 2075. However, when moving good Excel into Smartsheet it reverts the dates. There is no formula it is just a straight copy paste. Does Smartsheet give you the ability to not modify the century for future dates or is this a hard coded feature in the program?