Example code for converting time and timestamps to each other in iOS

//Get the time stamp of the current system time
#pragma mark - Get the time stamp of the current time
+(NSInteger)getNowTimestamp{

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

 [formatter setDateStyle:NSDateFormatterMediumStyle];

 [formatter setTimeStyle:NSDateFormatterShortStyle];

 [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // ------------Set the format you want, the difference between hh and HH: respectively representing 12-hour system and 24-hour system
 //Set the time zone, this is sometimes very important for time processing
 NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

 [formatter setTimeZone:timeZone];

 NSDate *datenow = [NSDate date];//The current time
 

 NSLog(@"The current time of the device:%@",[formatter stringFromDate:datenow]);

 //Method of time to time stamp:
 

 NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];

 

 NSLog(@"The current timestamp of the device:%ld",(long)timeSp); //The value of the timestamp
 

 return timeSp;

}

 

//Convert a time to a time stamp
#pragma mark - convert a time to a time stamp
+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{

 

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

 [formatter setDateStyle:NSDateFormatterMediumStyle];

 [formatter setTimeStyle:NSDateFormatterShortStyle];

 [formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ------------Set the format you want, the difference between hh and HH: respectively representing 12-hour system and 24-hour system
 

 NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

 [formatter setTimeZone:timeZone];

 

 NSDate* date = [formatter dateFromString:formatTime]; //-----------------------------------------------------------------------------------------------------------------------------
 //Method of time to time stamp:
 NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];

 

 NSLog(@"Convert a time to timestamp &&&&&&&&timeSp:%ld",(long)timeSp); //The value of the timestamp
 

 return timeSp;

}

 

//Convert a time stamp to time
#pragma mark - convert a timestamp into time
+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format{

 

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

 [formatter setDateStyle:NSDateFormatterMediumStyle];

 [formatter setTimeStyle:NSDateFormatterShortStyle];

 [formatter setDateFormat:format]; // (@"YYYY-MM-dd hh:mm:ss") --------------Set the format you want, the difference between hh and HH: respectively representing 12-hour system and 24-hour system
 NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

 [formatter setTimeZone:timeZone];

 NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];

 NSLog(@"1296035591 = %@",confromTimesp);

 

 NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];

 

 //NSLog(@"&&&&&&&confromTimespStr = : %@",confromTimespStr);

 

 return confromTimespStr;

}