Objective-C日期相关工具方法

//date根据formatter转换成string
+(NSString*)dateToString:(NSString *)formatter date:(NSDate *)date { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:formatter]; return[dateFormatter stringFromDate:date]; } //string类型的时间戳转换成时间
+(NSString*)dateStringToString:(NSString *)dateStr { if ([dateStr isKindOfClass:[NSNull class]]) { return nil; } else { NSInteger time = [dateStr intValue]; NSDate *date = [NSDate dateWithTimeIntervalSince1970:time]; NSString *timestr = [NSString stringWithFormat:@"%@",date]; NSRange rang; rang.location = 0; O rang.length = 10; NSString *needtime = [timestr substringWithRange:rang]; return needtime; } } //将日期从原格式转换成需要的格式
+(NSString*)convertDateFormatter:(NSString*)sourceFormatter targetFormatter:(NSString*)targetFormatter dateString:(NSString*)dateString { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:sourceFormatter]; NSDate *date = [dateFormatter dateFromString:dateString]; [dateFormatter setDateFormat:targetFormatter]; return[dateFormatter stringFromDate:date]; } //将日期字符串转换成date
+(NSDate *)stringToDate:(NSString *)formatter dateString:(NSString *)dateString { NSDateFormatter *dateFormatter= [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:formatter]; return [dateFormatter dateFromString:dateString]; }