It looks like the BIOS time is best set to local time for dual-boot, but there can be issues (like Daylight Saving Time changes). Here is a good explanation and instruction for how to set your Linux Mint:
https://www.howtogeek.com/323390/ho...ux-showing-different-times-when-dual-booting/
https://www.howtogeek.com/323390/ho...ux-showing-different-times-when-dual-booting/