This is a real time clock based on the DS3234 Real Time Clock IC. The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections of leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided.
Resources
Schematic
Eagle Files
Hookup Guide
Datasheet(DS3234)
Arduino Library
Example Sketch
Github