Documented via google search results... they are built into the (all?) C compiler. Really useful sometimes. I sometimes use them to output the firmware build date/time on a LCD on power-up for various things. Etc. J Justin Richards wrote: > There are some __DATE_ and __TIME__ macros used in example code. > > the compiler is C18, and I have searched C18 Library, C18 help and > C18 getting started help. Where is this stuff documented. > > Are there other macros like these. > > I am using mplab. > > Cheers Justin -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist