IC/Module: DS1307 Serial Real-Time Clock (RTC)
DS1307 is a low-power, full binary-coded decimal clock/calendar plus 56 bytes of NV SRAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month can be adjusted automatically for months fewer than 31 days, including corrections for leap year. It features a backup power supply that continues the timekeeping operation even when the power supply goes off.