NSDate一些随笔

一开始感觉NSDate有很多要写的，但是真要自己细细写下，反而觉得有的太繁琐或者记不住，或者压根不如用到的时候直接百度，网上一大推基本的方法运用。所以在这里自己总结了几个方法，希望有能帮到大家

1.传入北京时间( [NSDate date]是美国时间 )，获取北京时间各个参数(年月日星期)

- (NSString*)requireBeijingTime:(NSDate*)date {
NSArray *weekdays = [NSArrayarrayWithObjects: [NSNullnull],@"周日",@"周一",@"周二",@"周三",@"周四",@"周五",@"周六",nil];

NSCalendar *greCalendar = [[NSCalendaralloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

NSDateComponents *dateComponents = [greCalendarcomponents:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday|
NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond fromDate:[date dateByAddingTimeInterval:-8*3600]];

NSLog(@"%ld -- %ld -- %ld -- %ld -- %ld", (long)dateComponents.year, (long)dateComponents.month, (long)dateComponents.day, (long)dateComponents.minute,(long)dateComponents.hour);
NSLog(@"week== %@", weekdays[dateComponents.weekday]);

return [NSString stringWithFormat:@"%ld",(long)dateComponents.hour];

}

2.将字符串格式时间转换成NSDate

+ (NSDate*)NSStringWithS:(NSString*)string {

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

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

NSDate*date = [dateFormatter dateFromString:string];

returndate;

}

3.将NSDate格式转成字符串

+ (NSString*)NSDateWithD:(NSDate*)date {

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

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

NSString*strDate = [dateFormatterstringFromDate:date];

returnstrDate;

}

4.获取结束时间和开始时间之间的差值

-(CGFloat)getTimeWithBeginTime:(NSDate*)beginTime andEndTime:(NSDate*)endTime{

NSTimeIntervalsecondsBetweenDates= [endTimetimeIntervalSinceDate:beginTime];

CGFloattime=secondsBetweenDates/3600;

returntime;

}

好了，感觉也没什么，最后在上个获取百度时间的，防止用户修改系统时间，产品找你茬
5.获取百度时间

- (NSDate*)requireBAIDUTIME {

NSString*urlString =@"http://www.baidu.com";

NSString* urlStringg = [urlStringstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//实例化NSMutableURLRequest，并进行参数配置

NSMutableURLRequest*request = [[NSMutableURLRequestalloc]init];

[requestsetURL:[NSURLURLWithString: urlStringg]];

[requestsetCachePolicy:NSURLRequestReloadIgnoringCacheData];

[requestsetTimeoutInterval:2];

[requestsetHTTPShouldHandleCookies:FALSE];

[requestsetHTTPMethod:@"GET"];

NSHTTPURLResponse*response;

[NSURLConnectionsendSynchronousRequest:request

returningResponse:&responseerror:nil];

//处理返回的数据

//NSString *strReturn = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

PALog(@"response is %@",response);

NSString*date = [[responseallHeaderFields]objectForKey:@"Date"];

PALog(@"获取网络的字符串......%@",date);

date = [datesubstringFromIndex:5];

date = [datesubstringToIndex:[datelength]-4];

NSDateFormatter*dMatter = [[NSDateFormatteralloc]init];

NSTimeZone*timeZone = [NSTimeZonetimeZoneWithName:@"GMT"];

[dMatter setTimeZone:timeZone];

dMatter.locale= [[NSLocalealloc]initWithLocaleIdentifier:@"en_US_POSIX"];

[dMattersetDateFormat:@"dd MMM yyyy HH:mm:ss"];

NSDate *netDate = [[dMatter dateFromString:date]dateByAddingTimeInterval:60*60*8];

PALog(@"来自网络的最后时间%@",netDate);

returnnetDate;

}

谢谢。