What is meaning of "unsigned int Date :5;" in structure ?

[Qt embedded developer]

I have seen one code where i found structure declared like below. i want to know what is meaning of

unsigned int Date :5;

in this structure ?

 struct structDateStamp
    {
    	unsigned int Date 	:5;
    	unsigned int Month  :4;
    	unsigned int Year 	:5;
    	unsigned int Hour 	:5;
    	unsigned int Min 	:6;
    	unsigned int Sec 	:6;
    };

[jsulm]

@Qt-embedded-developer This struct is a bit-field, see https://docs.microsoft.com/en-us/cpp/cpp/struct-cpp?view=msvc-170
Date consumes first 5 bits, Month next 4 and so on.

[J.Hilk]

@Qt-embedded-developer I actually had to look that up!
Those are bit fields. Basically, the number after the colon describes how many bits that field uses.

Credits link

[vamsi_siddhani]