Q. When I paste a large amount of data into Excel containing dates as far back as the 1800s, the recent dates display correctly as valid dates, but the older dates automatically convert to text. I ...

Office solution: Clearing up that wacky date problem when copying sheets Your email has been sent This week, learn the solution to the last Office challenge: Why does Excel change dates when I copy a ...

If you need to calculate dates in your spreadsheets, Excel uses its own unique system, which it calls Serial Numbers. Every date (month, day, year) and time (hour, minute, and second) has an ...