//获得当前时间并且转为字符串
- (NSString *)dateTransformToTimeString
{
NSDate *currentDate = [NSDate date];//获得当前时间为UTC时间 2014-07-16 07:54:36 UTC (UTC时间比标准时间差8小时)
//转为字符串
NSDateFormatter*df = [[NSDateFormatter alloc]init];//实例化时间格式类
[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];//格式化
//2014-07-16 07:54:36(NSString类)
NSString *timeString = [df stringFromDate:currentDate];
return timeString;
}
//获取当前时间转为时间戳
- (NSString *)dateTransformToTimeSp
{
UInt64 recordTime = [[NSDate date] timeIntervalSince1970]*1000;//客户端当前13位毫秒级时间戳
NSString *timeSp = [NSString stringWithFormat:@"%llu",recordTime];//时间戳转字符串(13位毫秒级时间戳字符串)
return timeSp;
}
1 //时间戳字符串1469193006001（毫秒）1469193006.001（毫秒，1469193006001234（微秒）1469193006.001234（微秒）转 UTC时间2016-08-11T07:00:55.611Z
2 - (NSString *)timespToUTCFormat:(NSString *)timesp
3 {
4 NSString *timeString = [timesp stringByReplacingOccurrencesOfString:@"." withString:@""];
5 if (timeString.length >= 10) {
6 NSString *second = [timeString substringToIndex:10];
7 NSString *milliscond = [timeString substringFromIndex:10];
8 NSString * timeStampString = [NSString stringWithFormat:@"%@.%@",second,milliscond];
9 NSTimeInterval _interval=[timeStampString doubleValue];
10 NSDate *date = [NSDate dateWithTimeIntervalSince1970:_interval];
11
12 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
13 NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
14 [dateFormatter setTimeZone:timeZone];
15 [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"];
16 NSString *dateString = [dateFormatter stringFromDate:date];
17
18 return dateString;
19 }
20 return @"";
21 }
//13位时间戳1469193006001（毫秒）转 系统时间2016-08-11 08:55:36
1 + (NSString *)timespToYMDFormat:(NSNumber *)timesp
2 {
3 NSString *stime = [timesp stringValue];
4 NSTimeInterval time = [[stime substringToIndex:10] doubleValue];
5 NSDate *detaildate=[NSDate dateWithTimeIntervalSince1970:time];
6 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
7 [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
8
9 return [dateFormatter stringFromDate: detaildate];
10 }
//时间转时间戳的方法:sendDate为NSDate类
NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[sendDate timeIntervalSince1970]];
如果只获取当前的年月日，用NSDate 直接截取是不对的，以下方法提供了获取当前的年月日等等
// 获取代表公历的NSCalendar对象
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
// 获取当前日期
// 定义一个时间字段的旗标，指定将会获取指定年、月、日、时、分、秒的信息
unsigned unitFlags = NSCalendarUnitYear |
NSCalendarUnitMonth | NSCalendarUnitDay |
NSCalendarUnitHour | NSCalendarUnitMinute |
NSCalendarUnitSecond | NSCalendarUnitWeekday;
// 获取不同时间字段的信息
NSDateComponents* comp = [gregorian components: unitFlags
fromDate:localeDate];
NSInteger year = comp.year;
//下面是可以获取的内容 //
@property NSInteger era;
@property NSInteger year;
@property NSInteger month;
@property NSInteger day;
@property NSInteger hour;
@property NSInteger minute;
@property NSInteger second;
@property NSInteger nanosecond NS_AVAILABLE(10_7, 5_0);
@property NSInteger weekday;
@property NSInteger weekdayOrdinal;
@property NSInteger quarter NS_AVAILABLE(10_6, 4_0);
@property NSInteger weekOfMonth NS_AVAILABLE(10_7, 5_0);
@property NSInteger weekOfYear NS_AVAILABLE(10_7, 5_0);
@property NSInteger yearForWeekOfYear NS_AVAILABLE(10_7, 5_0);