Arduino Due RTC Library

hai Markus_L811,,thanks you very much for your library..it more simple better than external RTC...i have tried it but makus
when i tried it the example "Due-RTC_SAMPLE "...first time set rtc_clock.set_time(10, 29, 49) and then the clock is turn on...but the problem when i close the "serial view/serial monitor" and open again serial "serial view/serial monitor" the time clock set again in 10, 29, 49...it does'nt continue with when we open the "serial view/serial monitor" first....in my research planning i will make this rtc library to schedule the sending data of sensor...
every 20 minute send data of accelerometer sensor
every 10 minute send data strain gauge sensor

plese help me for this research...
thank you very much for your attention and your library.. markus,,god bles you..