Thanks Jace Hall (1875628), I checked every points for H/W and S/W, just come to know about my S/W flow which affected it. Actually I am configuring RTC via ZigBee(wireless) commands (own command list) which set RTC perfectly but after power off. I need to enable basic resisters of RTC which was I didn't So RTC module was running with battery and update values but I wasn't able to get it. So I put basic configuration and RTC enable function at starting of program. know its working perfectly. Thanks for your support. Regards Bhavdipsinh
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