iOS 备忘录

1 //先是将指定时区的日期转换为当前时区时间:   
2     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
3     [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
4     [formatter setTimeZone:[NSTimeZone defaultTimeZone] ] ;
5     NSDate *time = [formatter dateFromString:@"2011-09-27 10:11:30 +0600"];    
6     NSLog(@"Local time is %@",[formatter stringFromDate: time]);  

1 //然后是将当前时区时间转换为特定时区的:
2     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
3     [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
4     [formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Asia/Tokyo"]];
5     NSLog(@"Now Tokyo time is %@",[formatter stringFromDate:[NSDate date]]);    

1 //下面是将指定时区的某个日期时间转化为指定时区的时间    
2     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
3     [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
4     [formatter setTimeZone:[NSTimeZone timeZoneWithName:@"Asia/Tokyo"]];
5     NSDate *time = [formatter dateFromString:@"2011-09-27 10:11:30 +0600"];
6     NSLog(@"Tokyo time is %@",[formatter stringFromDate: time]);