How convert bytes to ASCII?

Hi

How can I convert bytes to ASCII?, I read wikipedia about UTF-8 and I understood a little bit about add or split bytes to change the value.

Now I have those bytes

0xC7 0xE6 0xC2 0x91 0x93 0x7B 0xCE 0x01

And I found a program (DCode) that convert to 64 bits little-endian, supposedly those bytes in ASCII is this.

lun, 08 julio 2013 04:28:17 UTC <---

But I don't understand how it works and I want to know how do it on C but I have no idea how can I do this.

Can anyone help me with a example? please...

regards