3. RTC Test Commands in Linux

3.1. date and hwclock

• date commandused to queryorsetcurrent Linux system (software) clock. Linux bootwhen, systemclockwillfromhardwareclock (RTC) synchronization.

• hwclock commandused to queryorsethardwareclock (RTC) time.

Example:Set the system time

date "2020-10-17 9:48:30"
# Sat Oct 17 09:48:30 CST 2020

Example:Read the system time

date
# Sat Oct 17 09:48:34 CST 2020

Example:Read the hardware clock (RTC) time

hwclock
# Sat Oct 17 09:56:03 2020  0.000000 seconds

Example:Write the system time to the hardware clock

hwclock -w

Example:Synchronize the hardware clock to the system time

hwclock -s