Compiling...
date1tst.cpp
Linking...
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/ass3.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe
Compiling...
date1tst.cpp
Linking...
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/ass3.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe
It means you are missing a WinMain function.
If your writing a windows app you need a WinMain() instead of a main(). Or if you are writing a console app you are probably compiling it as a windows app.
All spelling mistakes, syntatical errors and stupid comments are intentional.