万年历，包括时钟芯片ds12c887，ds18b20 nokia5110，AT89S52单片机-Calendar, including the clock chip ds12c887, ds18b20 nokia5110, AT89S52 single chip.

AT89s52的DS1302万年历程序，已经编译通过可以使用。-DS1302 calendar of AT89s52 procedures have been adopted by the compiler can use.