Stub current time

Stub current time.txt

// Works only `NSDate()`! `Date()` will not be stubbed. Uses a Private API and should not be in main project target or your application will be rejected !!! 

extension NSDate {
    
    func stubAsCurrenDate(block: () -> Void) {
        let customDateBlock: @convention(block) (AnyObject) -> NSDate = { _ in self }
        let implementation = imp_implementationWithBlock(unsafeBitCast(customDateBlock, to: AnyObject.self))
        let method = class_getInstanceMethod(NSClassFromString("__NSPlaceholderDate"), #selector(NSObject.init))
        let oldImplementation = method_getImplementation(method)
        method_setImplementation(method, implementation)
        block()
        method_setImplementation(method, oldImplementation)
    }
}