For anyone still looking this up, ignore the fearmongering. Worst case a little of your food spoils and it'll be warm enough to collect more. type "/time setmonth mar" (or the first 3 letters of whatever month you want) and keep going. The calendar isn't as fragile as people make it out to be.
If you want more options look at the wiki https://wiki.vintagestory.at/List_of_server_commands/en#/time