ios NSDate 操作

1〉NSDateFormatter ，设置日期格式；

2>NSLocale ,设置时区；

3〉df dateFromString:birthday；将字符格式发到日期格式；

@implementation Person
@systhesize fistName,lastName,birthDate,salary;

- (NSDate *)makeBirthDate:(NSString *)birthday
{
  NSDateFormatter df=[[NSDateFormatter alloc] init];
  [df setDateFormat:@"yyyy-MM-dd"];//[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

  NSLocale *locale=[[NSLocale alloc] initWithLocaleIdentifier:@"en-US"];
  [df setLocale:locale];

  NSDate *date=[df dateFromString:birthday];
  [df release];
  [ locale release];
 
  return date;
}