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These functions are found in the time.h that comes with the SDK. Projects can #include time.h & make calls to these functions without errors from the compiler. The linker seems unable to find these functions as if they've been declared but not somewhere in code. Any ideas where I might find these functions in the SDK?
Not all standard library functions are available in the chip (because they would not have fit in the limited ROM and RAM available in the chip). You could try adding specific libraries to you application, add something like this to your makefile.mk:
EXTRA_LD_FLAGS += -lgcc
EXTRA_LD_FLAGS += -lm
but I suspect not all libraries can be added. Time functions are a part of the standard library (libc.a), and these are not fully implemented on this platform. BLE Time service is recommended instead, see Apps/watch sample application.