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• Days between dates. The historical version.

  Calculates number of days between two dates taking in account the date of transition to Gregorian calendar.

• Days count in several date spans

  The calculator gives total number of days in date span list. Each date span is defined by start date and end date. The calculator can exclude multiple date date span intersections.

• Conversion of pounds into inches

  Conversion of old pounds artillery caliber into more modern inches and millimeters