IF EXISTS(SELECT NAME FROM sysobjects s WHERE s.name='fCalculateWatch')
	DROP FUNCTION fCalculateWatch
GO
CREATE FUNCTION fCalculateWatch(@StringSaat nvarchar(5), @Tedad INT) RETURNS nvarchar(5) AS
BEGIN
	declare @Res nvarchar(5); 
	declare @Saat int;
	declare @Min int;
	declare @MinTemp int;
	
	set @Saat = cast( left( @StringSaat ,2 ) as int) * @tedad;
	set @Min = cast( right( @StringSaat ,2 ) as int) * @tedad;
	
	
	if( @min = 60)
		begin
			set @res =  RIGHT('00' + (cast(@Saat as nvarchar) + 1) , 2)   + ':00';
		end
	else if(@min < 60 )
		begin
			set @res = RIGHT('00' +cast(@Saat as nvarchar), 2) + ':' +  RIGHT('00' + cast(@min as nvarchar) , 2) ;
		end
	else if( @min > 60 )
		begin
			set @MinTemp = @min / 60;
			set @Saat = @Saat + @MinTemp;
			set @MinTemp = @min % 60;
			set @Res =  RIGHT('00' + cast(@Saat as nvarchar) , 2)  + ':' + RIGHT('00' + cast( @MinTemp as nvarchar) , 2) 
		end
	
	return @res ;
END

--select dbo.fCalculateWatch('01:00', 10 );