NSDate和NSString的转换及判定是昨天，今天，明天
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用于uidate，picker。。
+(NSDate*) convertDateFromString:(NSString*)uiDate
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init] ;
[formatter setDateFormat:@"yyyy年MM月dd日"];
NSDate *date=[formatter dateFromString:uiDate];
return date;
}
-(NSString *)getCurrentTime:(NSDate *)date{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:MM:SS"];
NSString *dataTime = [formatter stringFromDate:date];
return dataTime;
}
//判定是昨天，今天，明天
-(NSString *)compareDate:(NSDate *)date{
NSTimeInterval secondsPerDay = 24 * 60 * 60;
NSDate *today = [[NSDate alloc] init];
NSDate *tomorrow, *yesterday;
tomorrow = [today dateByAddingTimeInterval: secondsPerDay];
yesterday = [today dateByAddingTimeInterval: -secondsPerDay];
// 10 first characters of description is the calendar date:
NSString * todayString = [[today description] substringToIndex:10];
NSString * yesterdayString = [[yesterday description] substringToIndex:10];
NSString * tomorrowString = [[tomorrow description] substringToIndex:10];
NSString * dateString = [[date description] substringToIndex:10];
if ([dateString isEqualToString:todayString])
{
return @"今天";
} else if ([dateString isEqualToString:yesterdayString])
{
return @"昨天";
}else if ([dateString isEqualToString:tomorrowString])
{
return @"明天";
}
else
{
return dateString;
}
}
输入的日期字符串形如：@"1992-05-21 13:08:08"
- (NSDate *)dateFromString:(NSString *)dateString{
NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
[dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm:ss"];
NSDate *destDate= [dateFormatter dateFromString:dateString];
[dateFormatter release];
return destDate;
}
- (NSString *)stringFromDate:(NSDate *)date{
NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
//zzz表示时区，zzz可以删除，这样返回的日期字符将不包含时区信息。
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];
NSString *destDateString = [dateFormatter stringFromDate:date];
[dateFormatter release];
return destDateString;
}
- (IBAction)handleDidPressBtn1{
NSLog(@"%@/n", [selfdateFromString:@"2011-08-09 12:02:01"]);
NSLog(@"%@/n", [selfstringFromDate:[selfdateFromString:@"2011-08-09 12:02:01"]]);
}
输出结果如下：
2011-08-09 04:02:01 +0000
2011-08-09 12:02:01 GMT+08:00
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