objective-c 日期和字符串的相互转换

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#import <Foundation/Foundation.h>@interface NSDate (StringAndDate)//fromatter:@"yyyy-MM-dd HH:mm" ; stringDate:@"2012-03-01 23:12"+ (NSDate *)getDateFromString:(NSString *)stringDate withFormatter:(NSString *)formatter;+ (NSString *)getStringFromDate:(NSDate *)date withFormatter:(NSString *)formatter;@end

#import "NSDate+StringAndDate.h"@implementation NSDate (StringAndDate)+ (NSDate *)getDateFromString:(NSString *)stringDate withFormatter:(NSString *)formatter{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:formatter];    NSDate *date = [dateFormatter dateFromString:stringDate];    [dateFormatter release];        return date;}+ (NSString *)getStringFromDate:(NSDate *)date withFormatter:(NSString *)formatter{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:formatter];    NSString *dayString = [dateFormatter stringFromDate:date];    [dateFormatter release];        return dayString;}@end

调用方法：

    NSDate *date1 = [NSDate getDateFromString:startStopTime withFormatter:@"yyyy-MM-dd,HH:mm"];

    NSString *dayString = [NSDate getStringFromDate:day withFormatter:@"yyyy-MM-dd"];