Extension Methods from Victor Rodrigues
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        EndOfTheMonthReturns datetime corresponding to last day of the month 
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        EndOfTheDayReturns datetime corresponding to day end 
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        FillDifferent way to use String.Format 
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        BeginningOfTheMonthReturns datetime corresponding to first day of the month 
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        BeginningOfTheDayReturns datetime corresponding to day beginning 
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        ExcelColumnNameReturns the excel column name from a column index 
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        InReturns true when a number is included in the specified collection. 
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        ExcelColumnIndexReturns the excel column index from a column name 
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        Intuitive date creationAllows you to create date very easily, like 19.June(1970)