Hi, On 01/08/2020 19:20:07+0800, Grant Feng wrote: > 1969-12-31T23:59:59 is an error more clear than Invalid argument Definitively not, 1969-12-31T23:59:59 is a valid date and should not be returned when it is known the current date is not set in the RTC. > > For example, when the RTC clock is not set, it will print a kernel > error log every time someone tries to read the clock: > ~ # hwclock -r > hwclock: RTC_RD_TIME: Invalid argument > > It's clear and easy to understand what happened if print > 1969-12-31T23:59:59 in this situation： > ~ # hwclock -r > Wed Dec 31 23:59:59 1969 0.000000 seconds > How do you know this is an error an not what is actually set on the RTC? -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
