Why does script or watch output look weird in saved text files

I use the script command to save the whole session, but the output in the text file is something weird, and I opened it with the cat command in the terminal, and everything became ok. How can I save it in a text file that becomes readable? This also happened with the watch command. How to fix it? The following commands (individually) result in a.txt containing weird text:

watch date | tee a.txt

script a.txt ...

for example this is the out put of watch date | tee watch.txt