Basically OpenWRT is for dedicated, purpose built hardware, highly compact and essentially “embedded”. OPNSense is for running a (potentially much more capable) firewall on x86/x64 (even if it’s a small specimen like N100 or whatever). They fill a somewhat different role.
Depends on your date format. For it to be a problem to begin with, you need to use a date format with “/” as the separator. If it’s 1st of Jan or Feb 1st then depends on the order.
And of course you need to enter an actual fraction, instead of like 0.5. This also narrows down the locations where this is an issue considerably. I think it’s mostly north America where fractions are more commonly used instead of decimals die to the imperial system, but there might be other places where it’s common, too, and I just don’t know about it.
This is hilarious to me. We make 400g for 2 (normal sized) people.