Project builds fine with Visual Studio but fails from the command line

Question

I have a solution which builds fine when running through Visual Studio 2015 but when I run from the command line I run into the error

error CS1056: Unexpected charac

Answer 1

$"{deadLineTime.Deadline:htt}"

is a syntax sugar for

string.Format("{0:htt}", deadline.Deadline);

same it goes for

$"{deadLineTime.Deadline:h:mmtt}"

as

string.Format("{0:h:mmtt}", deadline.Deadline);

try to replace them