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lang-cpp
vector,list, etc), there are different date data structures. Each has strengths and weaknesses. You get to choose the data structure that is optimized for your heaviest use.year_month_dayis good at year and month calendrical arithmetic. If you're doing a lot of that, stay with that data structure without converting tosys_days. Andsys_daysis good at chronological arithmetic (which includesdaysunits), and is good at converting to/from date/times. And you can losslessly convert between the two.