The date difference calculator takes two dates and expresses the gap between them several ways at once: total days, whole weeks with a remainder, and years, months and days. Which date is entered first makes no difference to the size of the answer.
Showing more than one form is deliberate, because the forms genuinely disagree and knowing which one a question wants is most of the work. From 30 November to 1 February is 63 days in a common year; it is also "two months" in the sense that December and January have both gone by, and "two months and two days" if whole months are counted from the start date. Every one of those readings is defensible, and calendar months running from 28 to 31 days mean any month-based figure has a rounding decision buried in it.
There is a second calendar to keep in view here. A span converted into Hijri months will not produce the same count, because lunar months run 29 or 30 days and twelve of them fall about eleven days short of a solar year. Where a document states a period in Hijri months and a schedule states it in Gregorian ones, the total in days is the only figure both systems agree on, and it is the one shown first.
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