It's frustrating when people just pick an arbitrary interpretation of old dates instead of actually looking at the context. Even beyond Julian vs. Gregorian lea

It's frustrating when people just pick an arbitrary interpretation of old dates instead of actually looking at the context. Even beyond Julian vs. Gregorian leap-year rules, we also see historical variation in the start of the numbered year (January 1 vs. different dates in March). I'm not aware of any software that can represent all such dates as they appear in the primary sources: they always have to be translated through someone's manual effort, which can easily introduce misinterpretations. At least the day of week, when available, can help double-check a calendar assignment.