RTC date-time verification in Nextion HMI screens?

Projects Programming
1

Hello friends,

Nextion says that if the date and time you set on their website are correct, rtc6 will return the day of week (from 0 to 6). it's fine here, but if the date or time is incorrect, I expect it to return a value outside the range 0 to 6.

But nextion returning the last correct value.
This does not help me to handling the error.

Is there an easy way to handling this error?

Thanks.

2

I think there is no other way out of this long way: