iOS Method for Getting Current Time and Current Timestamp

// Get the current time 
+(NSString*)getCurrentTimes{
 NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
 // ---------- Set the format you want ,hh And HH Difference between : Representation separately 12 Hourly system ,24 Hourly system 
 [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
 // Now time , You can output it to see what format it is 
 NSDate *datenow = [NSDate date];
 //---------- Will nsdate Press formatter Format to nsstring
 NSString *currentTimeString = [formatter stringFromDate:datenow];
 NSLog(@"currentTimeString = %@",currentTimeString);
 return currentTimeString;
}

There are two ways to get the current timestamp (in seconds)

+(NSString *)getNowTimeTimestamp{
 NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
 [formatter setDateStyle:NSDateFormatterMediumStyle];
 [formatter setTimeStyle:NSDateFormatterShortStyle];
 [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // ---------- Set the format you want ,hh And HH Difference between : Representation separately 12 Hourly system ,24 Hourly system 
 // Setting Time Zone , This is sometimes very important for the processing of time 
 NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];
 [formatter setTimeZone:timeZone];
 NSDate *datenow = [NSDate date];// Now time , You can output it to see what format it is 
 NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]];
 return timeSp;
}
+(NSString *)getNowTimeTimestamp2{
 NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];
 NSTimeInterval a=[dat timeIntervalSince1970];
 NSString*timeString = [NSString stringWithFormat:@"%0.f", a];// Convert to character type 
 ;
return timeString;
}
 // Get the current timestamp   (In milliseconds) 
+(NSString *)getNowTimeTimestamp3{
 NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
 [formatter setDateStyle:NSDateFormatterMediumStyle];
 [formatter setTimeStyle:NSDateFormatterShortStyle];
 [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss SSS"]; // ---------- Set the format you want ,hh And HH Difference between : Representation separately 12 Hourly system ,24 Hourly system 
 // Setting Time Zone , This is sometimes very important for the processing of time 
 NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];
 [formatter setTimeZone:timeZone];
 NSDate *datenow = [NSDate date];// Now time , You can output it to see what format it is 
 NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]*1000];
 return timeSp;
}