iOS获取当前时间 NSDate（NSCalendar）获取当前时间

来源：互联网发布：oracle数据库oblob操作编辑：程序博客网时间：2024/05/10 15:25

新人一枚，如果大家有更好的方法，请大家多多指教。。。
通过NSDate获取当前时间，并格式化输出，以及将已有的字符串（如：@”2015-02-12 13:23:20”）转换为NSDate
/*
获取争取的当地时间
*/
NSDate *senddate=[NSDate date];
NSTimeZone *zone = [NSTimeZone systemTimeZone];
NSInteger interval = [zone secondsFromGMTForDate: senddate];
NSDate *localDate = [senddate dateByAddingTimeInterval: interval];

/*    将时间格式化转成字符串输出 */NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];[dateformatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];NSString *locationString=[dateformatter stringFromDate:localDate];NSLog(@"locationString:%@",locationString);/*    将已有的字符串转换成date */NSString *timeStr = @"2015-02-12 13:23:20";NSDateFormatter *format=[[NSDateFormatter alloc] init];[format setDateFormat:@"YYYY-MM-dd HH:mm:ss"];NSDate *fromdate=[format dateFromString:timeStr];NSTimeZone *fromzone = [NSTimeZone systemTimeZone];NSInteger frominterval = [fromzone secondsFromGMTForDate: fromdate];NSDate *fromDate = [fromdate  dateByAddingTimeInterval: frominterval];NSLog(@"\nfromDate:%@ \nsenddate:%@",fromDate,localDate);/*    比较时间 */NSComparisonResult result = [localDate compare:fromDate];if (result == NSOrderedDescending) {    NSLog(@"localDate 比 fromDate 晚");//date1 比 date2 晚} else if (result == NSOrderedAscending){    NSLog(@"localDate 比 fromDate 早");//date1 比 date2 早}

方法二
NSArray *weekArray = [[NSArray alloc]initWithObjects:@”星期日”,@”星期一”,@”星期二”,@”星期三”,@”星期四”,@”星期五”,@”星期六”, nil];
NSDate *date = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps;
comps = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday fromDate:date];
NSString *year = [NSString stringWithFormat:@”%zd”,[comps year]-2000];
NSString *month = [NSString stringWithFormat:@”%zd”,[comps month]];
NSString *day = [NSString stringWithFormat:@”%zd”,[comps day]];
NSString *hour = [NSString stringWithFormat:@”%zd”,[comps hour]];
NSString *minute = [NSString stringWithFormat:@”%zd”,[comps minute]];
NSString *second = [NSString stringWithFormat:@”%zd”,[comps second]];
NSString *weekday = nil;
if ([comps weekday] == 1) {
weekday = [NSString stringWithFormat:@”%zd”,[comps weekday]+6];
}else{
weekday = [NSString stringWithFormat:@”%zd”,[comps weekday]-1];
}
NSArray *array = [[NSArray alloc]initWithObjects:year,month,day,hour,minute,second,weekday, nil];

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