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The time-structure object itself has structure variables with difficult-to-remember names. You have no need to remember them, however, because you can extract values from those structure variables, and assign those values to global variables with fully spelled-out names, once and for all:
/* Extract useful information from the time structure */ year = 1900 + time_structure_pointer -> tm_year; month = time_structure_pointer -> tm_mon; day = time_structure_pointer -> tm_mday; hour = time_structure_pointer -> tm_hour; minute = time_structure_pointer -> tm_min;