@class NSString; @interface PFTimeService : NSObject <PFTimeService> @property (class, readonly) PFTimeService *defaultTimeService; @property (readonly) double timeIntervalSinceReferenceDate; @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (void)sleepForTimeInterval:(double)a0; - (unsigned long long)clock_gettime_nsec_np:(int)a0; @end