BUY DS1682 https://www.utsource.net/itm/p/794289.html
Total Elapsed Time Recorder with Alarm
Description: The DS1682 is a low-power, real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. Features: Low-power CMOS technology Real-time clock/calendar with leap year compensation Temperature-compensated crystal oscillator Programmable time-of-day alarm Programmable square-wave output Power-fail detect and time-stamp Battery-backup input I2C-compatible serial interface 8-pin SOIC package Applications: Automotive Industrial Home appliances Medical Networking Telecom (For reference only)