Objective-C logging

classNameAndMethodName.m

NSLog( @"class name: %@ method name: %@" , NSStringFromClass([self class]), NSStringFromSelector(_cmd) );

NSDate.m

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
NSString *format = @"yyyy/MM/dd HH:mm:ss Z";
[formatter setDateFormat:format];
NSDate *date = [[NSDate alloc] initWithString:@"2010-01-01 23:59:59 +0900"];
NSLog(@"date:%@", [formatter stringFromDate:date]);