Date

I took a date in a Database with the year 18,19,20,21,22 and i load it but it came as decimal but when i try to convert these to Date it comes out as 1900 and i don't know how to get the right date. Thanks in advance  for your upcoming solution

Here is the date but it is in decimal number but when i try to change it to date format it is giving me something else as shown below;