thanks。 

thanks Pedro 

i use this code to set RTC_WAKEUPCLOCK_CK_SPRE_17BITS, debug can comfirm the RTC_WAKEUPCLOCK_CK_SPRE_17BITS is set，so if i set RTC_WAKEUPCLOCK_CK_SPRE_17BITS, v0u32 = 64065,the fact is 17 hours, how can i set the period time more than 24 hours if v0u...

thanks Pedro，but  i set RTC_WAKEUPCLOCK_CK_SPRE_17BITS，so how can i set the period time more than 18 hours ，24 hours，can you give some code advice，thanks。

thanks Kim,the same to you, STM32L071KZT6。