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Perpetual calendar

jak obliczyć dzień tygodnia na podstawie daty?
Calculator gives what day of the week for the date specified by the user.                  

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Date calculator

Calculator allows you to calculate the date, which will be after a specified number of days, months and years from a certain date.
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Calculator seniority in Poland

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Calculator of days

The calculator allows you to search on the week after the date.
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Verification ISBN preview

Jak sprawdzić numer ISBN?
Jak zweryfikować numer ISBN?
Calculator allows you to verify the ISBN number entered.
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Human demand for water

The calculator calculates the interest of your body's daily requirement of water.        
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Rainwater tank

The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description      
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Buying on credit or leasing

Calculator allows you to compare the costs incurred when buying a car on credit and taking it on lease.
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Verification of the REGON number in Poland

Verifier allows you to validate entered REGON number