Provided that your system settings are correct, your local date and time now is . It is from the beginning of local year. Current Universal Date and Time is . So the Universal Time interval from the beginning of year is . This interval may be expressed in decimal days: . We define our parameter "Decimal Day of Year" that appears in the output tables and plots adding unity to this value. So, for example, the noon of January 1 corresponds to dDoY = 1.5. We consider this definition closer to intuitive perception of the notion "Day of Year". Present moment in this notation is characterized by the dDoY = . Comparing of this parameter with the maximum value of the time mark in our tables and plots allows one to judge about present status of dynasonde operation. Normally, in absence of system and network failures these should not differ more than by 0.007 (~10 min).