Considering how hard it is to actually brick a Nintendo Switch and the many ways to recover from a theoretical brick, I am doubtful you bricked your last console but I digress. As long as you make an eMMC backup with Hekate, you can recover from 99% of all potential bricks. You need BOOT0, BOOT1, and either eMMC raw GPP or eMMC SYS. Keep in mind if you only dump eMMC SYS, you will be missing any content installed to your internal memory which includes any save data or games/updates/DLC.
While I don't know what servers are used to determine the date and time, people within the community developed tools to change the time without being punished. The first one is called
switch-time; its an older homebrew application though so it may not work on the higher firmware versions. The other one is called
QuickNTP and it uses the overlay Tesla to sync the time. Both of these should be able to accomplish what you are looking for.
Well Hekate not only verifies the eMMC backups it makes but it also verifies them when you restore it so as long as Hekate doesn't throw any errors, that's all you need.