NSDate、NSString、long转化

- (NSDate
*)dateFromString:(NSString
*)dateString{

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

[dateFormatter
setDateFormat:
@"yyyy-MM-dd
HH:mm:ss"];

NSDate
*destDate= [dateFormatter
dateFromString:dateString];

return
destDate;

}

- (NSString
*)stringFromDate:(NSDate
*)date{

NSDateFormatter
*dateFormatter
=
[[NSDateFormatter
alloc]
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:@"MM-dd
HH:mm"];

NSString
*destDateString =
[dateFormatter stringFromDate:date];

return
destDateString;

}

-(NSString
*)stringFromValue:(NSString
*)value{

NSDate
*confromTimesp
=
[NSDate
dateWithTimeIntervalSince1970:[value
longLongValue]];

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

[formatter
setDateFormat:@"MM-dd
HH:mm"];

NSString
*date =
[formatter stringFromDate:confromTimesp];

return
date;

}