I just tried the same thing on Windows 7 and got some curious results: From July 31 2019 to Dec 30 2019: "5 months; 6 days", 152 days From July 31 2019 to

I just tried the same thing on Windows 7 and got some curious results: From July 31 2019 to Dec 30 2019: "5 months; 6 days", 152 days From July 31 2019 to Dec 31 2019: "5 months", 153 days I agree that there are 153 days from July 31 to Dec 31 (aug+sep+oct+nov+dec = 31+30+31+30+31 = 153) but I'd say that there are too many Februaries among the months in the first result.