[Obj-c] UNIX Timestamp 轉換成 NSDATE

Code

NSDateFormatter*dateFormat = [[NSDateFormatter alloc] init];

[dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

unsigned long long timestamp = [[[messages objectAtIndex:indexPath.row] objectForKey:@"timestamp"] longLongValue];
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timestamp];
NSString *dateStr = [dateFormat stringFromDate:date];