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.

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