Is there a simple way to get time time of day (17:30, 01:20...etc) that would work on iOS, OSX, Linux and Windows?
If not is there a Windows way and a posix way or something?
You can retrieve the time with
time_t now = time(NULL); or
You then usually convert to local time with
struct tm *tm_now = localtime(&now);. A
struct tm contains fields for the year, month, day, day of week, hour, minute, and second. If you want to produce printable output,
strftime supports that directly.
Both of these are in the C and C++ standards, so they are available on most normal platforms.
If you really only care about C++, you can use
std::put_time, which is similar to
strftime, but a little bit simpler to use for the typical case of writing the output to a stream.