This type defines a callback function to calculate and return the time parameter offsets from a calendar time object in GMT.
#include <prtime.h> typedef PRTimeParameters (PR_CALLBACK_DECL *PRTimeParamFn) (const PRExplodedTime *gmt);
The type PRTimeParamFn
represents a callback function that, when given a time instant in GMT, returns the time zone information (offset from GMT and DST offset) at that time instant.