The date difference calculator takes any two dates and expresses the gap between them in several forms at once: total days, complete weeks with a remainder, and years, months and days. Order does not matter — put the later date first and the result comes back the same size, described as a period rather than as a negative number.
The reason for showing more than one form is that they genuinely disagree, and knowing which one a question is asking for is half the work. Take 31 December to 1 March: that is 60 days in a common year, and it is also "two months" in the sense that both January and February have passed, and it is "one month and 29 days" if you count whole months from the start date. All three are defensible. Calendar months have between 28 and 31 days, so any figure built out of them carries a rounding decision somewhere inside it.
Where a period must be exact — a notice period, a limitation date, a milestone in a schedule — the total in days is the figure that cannot be argued with, and it is the one shown first here. If the two dates fall either side of the last Sunday in March or the last Sunday in October, when the UK moves between GMT and British Summer Time, the day total is still unaffected: whole dates are compared, not elapsed hours.
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