The Microcontroller based Analog and Digital Slave Clocks 12/24 Hrs selectable format with in built RTC are provided with various I/O interface like RS232/RS485/Wireless for connecting to Master Clocls and Standard Clocks of BCM/BC-SC/BC-TC/BC-MTC and BC-WC Series. Once synchronized, Uniform Standard Time will be displayed everywhere on all Analog and Digital Slave Clocks.