//  設(shè)置時(shí)間顯示格式:

  NSString *timeStr = @"2011-01-26 17:40:50";

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

  [formatter setDateStyle:NSDateFormatterMediumStyle];

  [formatter setTimeStyle:NSDateFormatterShortStyle];

  [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // ----------設(shè)置你想要的格式,hh與HH的區(qū)別:分別表示12小時(shí)制,24小時(shí)制

  //設(shè)置時(shí)區(qū),這個(gè)對于時(shí)間的處理有時(shí)很重要

  //例如你在國內(nèi)發(fā)布信息,用戶在國外的另一個(gè)時(shí)區(qū),你想讓用戶看到正確的發(fā)布時(shí)間就得注意時(shí)區(qū)設(shè)置,時(shí)間的換算.

  //例如你發(fā)布的時(shí)間為2010-01-26 17:40:50,那么在英國愛爾蘭那邊用戶看到的時(shí)間應(yīng)該是多少呢?

  //他們與我們有7個(gè)小時(shí)的時(shí)差,所以他們那還沒到這個(gè)時(shí)間呢...那就是把未來的事做了

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

  [formatter setTimeZone:timeZone];

  NSDate *date = [formatter dateFromString:timeStr]; //------------將字符串按formatter轉(zhuǎn)成nsdate

  NSLog(@"date = %@", date);

  NSDate *datenow = [NSDate date];//現(xiàn)在時(shí)間,你可以輸出來看下是什么格式

  NSLog(@"datenow = %@", datenow);

  NSString *nowtimeStr = [formatter stringFromDate:datenow];//----------將nsdate按formatter格式轉(zhuǎn)成nsstring，nsstring會顯示與當(dāng)前的時(shí)間吻合的串

  NSLog(@"nowtimeStr = %@", nowtimeStr);

//  時(shí)間轉(zhuǎn)時(shí)間戳的方法:

  NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]];

  NSLog(@"timeSp:%@",timeSp); //時(shí)間戳的值

//  時(shí)間戳轉(zhuǎn)時(shí)間的方法

  NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:1296035591];

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

  NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];

  NSLog(@"confromTimespStr = %@",confromTimespStr);

//  時(shí)間戳轉(zhuǎn)時(shí)間的方法:

  NSDateFormatter* formatter1 = [[NSDateFormatter alloc] init];

  [formatter1 setDateStyle:NSDateFormatterMediumStyle];

  [formatter1 setTimeStyle:NSDateFormatterShortStyle];

  [formatter1 setDateFormat:@"yyyyMMddHHMMss"];

  NSDate *date1 = [formatter1 dateFromString:@"1283376197"];

  NSLog(@"date1:%@",date1);

 

當(dāng)前時(shí)間是：14：41：57