Instance code of mutual conversion between time and timestamp in iOS

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// Gets the timestamp of the current system time 

#pragma mark -  Object for the current time   Time stamp 

+(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 ,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/Beijing"];

 [formatter setTimeZone:timeZone];

 NSDate *datenow = [NSDate date];// Now time 

 

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

 // Time-to-time stamp method :

 

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

 

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

 

 return timeSp;

}

 

// Convert a certain time into   Time stamp 

#pragma mark -  Convert a certain time into   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 ,hh And HH Difference between : Representation separately 12 Hourly system ,24 Hourly system 

 

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

 [formatter setTimeZone:timeZone];

 

 NSDate* date = [formatter dateFromString:formatTime]; //------------ Press the string formatter Turn into nsdate

 // Time-to-time stamp method :

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

 

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

 

 return timeSp;

}

 

// Converts a timestamp to   Time 

#pragma mark -  Converts a timestamp to   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 ,hh And HH Difference between : Representation separately 12 Hourly system ,24 Hourly 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;

}