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Test SDL_MCP79400 Version 1.0 - SwitchDoc Labs
Program Started at:2016-01-02 16:35:12

Raspberry Pi= 2016-01-02 16:35:12
Traceback (most recent call last):
File "testSDL_MCP79400.py", line 51, in
print "MCP79400=\t%s" % mcp79400.read_datetime()
File "/home/data/SDL_MCP79400.py", line 141, in read_datetime
self._read_minutes(), self._read_seconds(), 0, tzinfo=tzinfo)
ValueError: month must be in 1..12

addr = 0x6f data = 0x6 6 returndata = 0x16 16
addr = 0x6f data = 0x5 5 returndata = 0x21 21 << Leap Year breaks here.
addr = 0x6f data = 0x4 4 returndata = 0x2 2
addr = 0x6f data = 0x2 2 returndata = 0x16 16
addr = 0x6f data = 0x1 1 returndata = 0x35 35
addr = 0x6f data = 0x0 0 returndata = 0xc9 129

Fix: mask bit 5
def _read_month(self):
return _bcd_to_int(self._read(self._REG_MONTH)& 0x5F)

I haven't looked at the write functions as I'm just reading the time, but there might be a similar issue there.