NSString* date;
NSDateFormatter* formatter = [[NSDateFormatteralloc]init];
[formattersetDateFormat:@"YYYY-MM-dd%20hh:mm:ss"];
date = [formatterstringFromDate:[NSDatedate]];
date 显示为 2011-11-01%2012:12:12
想实现查找几天前的时间，可以用这个方法
NSDate* date = [[NSDate alloc] init];
date = [date dateByAddingTimeInterval:-5*3600*24];
这是用现在的时间，往前面减5天，得到的时间。
好简单！简单的很假！
获取连续日期：
NSDate *date = [NSDate date];
// 2013-04-07 11:14:45
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
// HH是24进制，hh是12进制
formatter.dateFormat = @"MM.dd";
NSDateFormatter *formatter2 = [[NSDateFormatter alloc] init];
// HH是24进制，hh是12进制
formatter2.dateFormat = @"YYYY-MM-dd";
// formatter.locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"] autorelease];
NSString *string = [formatter stringFromDate:date];
NSLog(@"%@", string);
// 返回的格林治时间
NSMutableArray *dates = [NSMutableArray array];
// NSMutableArray *weekDays = [NSMutableArray array];
NSString * registe = @"3";
if([registe integerValue]>1)
{
for (int i=0; i<[registe integerValue]; i++ ) {
NSDate *newDate = [[NSDate alloc] initWithTimeIntervalSinceReferenceDate:([date timeIntervalSinceReferenceDate] - 24*3600*i)];
NSString *currentDateStr = [formatter stringFromDate:newDate];
[dates addObject:currentDateStr];
NSLog(@"——————%@",dates);
}
for (int i= [registe intValue]; i<7; i++) {
NSDate *newDate = [[NSDate alloc] initWithTimeIntervalSinceReferenceDate:( [date timeIntervalSinceReferenceDate] +24*3600 *(i- ([registe intValue]-1))*24*3600)];
// NSDate *newDate = [[NSDate alloc] initWithTimeIntervalSinceReferenceDate:( [date timeIntervalSinceReferenceDate] +24*3600 *(i-1))];
NSString *currentDateStr = [formatter stringFromDate:newDate];
[dates addObject:currentDateStr];
NSLog(@"哈哈哈哈%@",dates);
}
}