# C++, 81 bytes

    [](){for(time_t t=0,y;t<24;cout<<put_time(gmtime(&y),"%R %l:00%P\n"))y=t++*3600;}

This code requires `using namespace std` somewhere preceding it.

It does a loop on the values 0...23. It multiplies each value by 3600, converts to a `tm` struct and prints it. The print format `%R` outputs the 24-hour and minute; the print formats `%l` and `%P` output the proper 12-hour parts; they require [GNU](http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html).

A working online version is [here](https://ideone.com/LSlJhG).