@interface CalSingleDatabaseInMemoryChangeTimestamp : NSObject <NSSecureCoding, NSCopying>
@property (class, readonly) BOOL supportsSecureCoding;
@property (readonly, nonatomic) unsigned long long others;
@property (readonly, nonatomic) unsigned long long myself;
- (id)init;
- (void)encodeWithCoder:(id)a0;
- (id)initWithDawnOfTime;
- (id)initWithTimestampForMyself:(unsigned long long)a0 others:(unsigned long long)a1;
- (id)initWithCoder:(id)a0;
- (id)copyWithZone:(struct _NSZone { } *)a0;
@end