> Have you considered simply using a seperate RTC chip to
> track the time?

There are several accurate low-power I2C/SPI RTC ICs

eg http://www.maxim-ic.com/products/timers/ds3234.cfm

@ Mouser http://nz.mouser.com/Search/Refine.aspx?Keyword=3DDS3234

(re-directed to NZ site - NZ$1 =3D US$0.82.6)
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