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The Pi RTC is based on the clock chip DS1307, it can provide a real-time clock(RTC) for raspberry pi via the I2C interface. Real-time clock of this module counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. If you want to keep this module timing when the Raspberry Pi is powered off, you need to put a 3-Volt CR1225 lithium cell in the battery-holder.

• Supports Raspberry Pi 2/ 3 B/B+ Zero/4
• Support seconds, minutes, hours, day of week, month, year
• 56-byte, battery-backed, non-volatile (NV) RAM for data storage
• Programmable square wave output signal
• Automatic power-fail detect and switch circuitry
• Dimension is 30mm x 23mm x 15mm

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Pi RTC and 2-pin header