获取当前时间
NSDate *startDate = [NSDate date]; // 获得时间对象
NSTimeZone *zone = [NSTimeZone systemTimeZone]; // 获得系统的时区
NSTimeInterval time = [zone secondsFromGMTForDate:startDate];// 以秒为单位返回当前时间与系统格林尼治时间的差
NSDate *dateNow = [startDate dateByAddingTimeInterval:time];// 然后把差的时间加上,就是当前系统准确的时间
时间戳转化为时间NSDate
- (NSString *)timeWithTimeIntervalString:(NSString *)timeString
{
NSDateFormatter *stampFormatter = [[NSDateFormatter alloc] init];
[stampFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
NSDate *stampDate2 = [NSDate dateWithTimeIntervalSince1970:[timeString doubleValue]];// 服务器返回的10位时间戳不用除以1000
NSDate *stampDate2 = [NSDate dateWithTimeIntervalSince1970:[timeString doubleValue]/1000.0];//服务器返回的13位时间戳要除以1000
NSString *dateString = [stampFormatter stringFromDate:stampDate2];
NSLog(@"时间戳转化时间 >>> %@",dateString);
return dateString;
}
时间转化为时间戳
// 当前时间
NSDate* date = [NSDate dateWithTimeIntervalSinceNow:0];
NSTimeInterval a=[date timeIntervalSince1970]*1000; // *1000 是精确到毫秒，不乘就是精确到秒
NSString *timeString = [NSString stringWithFormat:@"%.0f", a]; //转为字符型
通过比较时间与当前时间返回年月日的方法
- (void)getBabyDetailAge:(NSString *)date
{
// 获得日期对象
NSDateFormatter *formatter_ = [[NSDateFormatter alloc] init];
formatter_.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSDate *createDate = [formatter_ dateFromString:date];
NSCalendar *gregorian = [[ NSCalendar alloc ] initWithCalendarIdentifier : NSCalendarIdentifierGregorian];
NSUInteger unitFlags = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear;
NSDateComponents *components = [gregorian components:unitFlags fromDate:createDate toDate:[NSDate date] options: 0 ];
NSInteger years = [components year];
NSInteger months = [components month ];
NSInteger days = [components day ];
}
