objective c - Create NSDate from Unix timestamp

Question

How do I create an NSDate from a Unix timestamp?

channel.startDate = [NSDate dateWithTimeIntervalSince1970:
(NSTimeInterval)[channelJson objectForKey:@"broadcastStartedTime"]];

I get this error:

104: error: pointer value used where a floating point value was expected

channels.startDate is an NSDate*. The value for the key "broadcastStartedTime" is a Javascript Number converted into an NSNumber or NSDecimalNumber by the SBJson parser library.

Answer 1

Try this instead:

NSNumber *startTime = channelJson[@"broadcastStartedTime"];
channel.startDate = [NSDate dateWithTimeIntervalSince1970:[startTime doubleValue]];

Your value is trapped in a pointer type of NSNumber. The dateWithTimeIntervalSince1970 method is expecting a primitive NSTimeInterval (which, under the covers, is a double).