1、基本时间日历
// 1、获取当前时间
NSDate *now = [NSDate date];
NSDateFormatter *nowFormate = [[NSDateFormatter alloc] init];
nowFormate.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSString *nowTime = [nowFormate stringFromDate:now];
NSLog(@"nowTime = %@",nowTime);
// 2、拿现在的时间和过去时间或者将来时间对比，计算出相差多少天，多少年，多少秒等等；
NSDate *beforTime = [nowFormate dateFromString:@"2014-06-14 19:25:00"];
NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
//世纪
NSInteger era = kCFCalendarUnitEra;
//年
NSInteger year = kCFCalendarUnitYear;
//月
NSInteger month = kCFCalendarUnitMonth;
//小时
NSInteger hour = kCFCalendarUnitHour;
//分钟
NSInteger minute = kCFCalendarUnitMinute;
//秒
NSInteger second = kCFCalendarUnitSecond;
NSDateComponents *compsEra = [calender components:era fromDate:beforTime toDate:now options:0];
NSDateComponents *compsYear = [calender components:year fromDate:beforTime toDate:now options:0];
NSDateComponents *compsMonth = [calender components:month fromDate:beforTime toDate:now options:0];
NSDateComponents *compsHour = [calender components:hour fromDate:beforTime toDate:now options:0];
NSDateComponents *compsMinute = [calender components:minute fromDate:beforTime toDate:now options:0];
NSDateComponents *compsSecond = [calender components:second fromDate:beforTime toDate:now options:0];
NSLog(@"相差世纪个数 = %ld",[compsEra era]);
NSLog(@"相差年个数 = %ld",[compsYear year]);
NSLog(@"相差月个数 = %ld",[compsMonth month]);
NSLog(@"相差小时个数 = %ld",[compsHour hour]);
NSLog(@"相差分钟个数 = %ld",[compsMinute minute]);
NSLog(@"相差秒个数 = %ld",[compsSecond second]);
// 3、获取时间戳（相对于1970年）
CGFloat timestamp = now.timeIntervalSince1970;
NSLog(@"距离1970年有多少秒 = %f",timestamp);
// 4、计算距离现在有多少秒
CGFloat sinceNow = beforTime.timeIntervalSinceNow;
NSLog(@"距离现在有多少秒 = %f",fabs(sinceNow));
2、获取当前系统时间的时间戳
+(NSInteger)getNowTimestamp{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
//设置时区,这个对于时间的处理有时很重要
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSDate *datenow = [NSDate date];//现在时间
NSLog(@"设备当前的时间:%@",[formatter stringFromDate:datenow]);
//时间转时间戳的方法:
NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];
NSLog(@"设备当前的时间戳:%ld",(long)timeSp); //时间戳的值
return timeSp;
}
3、将某个时间转化成时间戳
+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSDate* date = [formatter dateFromString:formatTime]; //------------将字符串按formatter转成nsdate
//时间转时间戳的方法:
NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];
NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp); //时间戳的值
return timeSp;
}
4、将某个时间戳转化成 时间
+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:format]; // （@"YYYY-MM-dd hh:mm:ss"）----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];
NSLog(@"1296035591 = %@",confromTimesp);
NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];
//NSLog(@"&&&&&&&confromTimespStr = : %@",confromTimespStr);
return confromTimespStr;
}
5、获取当前时间字符串
- (NSString *)currentTimeStr {
NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd HH:mm"];
NSString *currentDateStr = [dateFormat stringFromDate:[NSDate date]];
return currentDateStr;
}
6、简单将时间字符串转换为NSDate
- (NSDate *)dateFromString:(NSString *)dateString {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm"];
NSDate *destDate= [dateFormatter dateFromString:dateString];
return destDate;
}
7、获取明天、下周、下个月时间字符串
typedef NS_ENUM(NSUInteger, EndTimeType) {
EndTimeTypeDay,
EndTimeTypeWeek,
EndTimeTypeMonth,
};
- (NSString *)currentCycleEndTimeStrWithType:(EndTimeType)type withCurrentDate:(NSString *)currentDateStr {
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:[self cycleDateFromString:currentDateStr]];
switch (type) {
case EndTimeTypeDay:
[components setDay:([components day]+1)];
break;
case EndTimeTypeWeek:
[components setDay:([components day]+7)];
break;
case EndTimeTypeMonth:
[components setMonth:([components month]+1)];
break;
default:
break;
}
NSDate *beginningOfWeek = [gregorian dateFromComponents:components];
NSDateFormatter *dateday = [[NSDateFormatter alloc] init];
[dateday setDateFormat:@"yyy-MM-dd"];
return [dateday stringFromDate:beginningOfWeek];
}
8、对比两个时间的先后关系
- (int)compareOneDay:(NSString *)oneDay withAnotherDay:(NSString *)anotherDay format:(NSString *)format {
NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:format];
NSDate *dateA = [dateFormat dateFromString:oneDay];
NSDate *dateB = [dateFormat dateFromString:anotherDay];
NSComparisonResult result = [dateA compare:dateB];
if (result == NSOrderedDescending) {
//NSLog(@"oneDay比 anotherDay时间晚");
return 1;
}
else if (result == NSOrderedAscending){
//NSLog(@"oneDay比 anotherDay时间早");
return -1;
}
//NSLog(@"两者时间是同一个时间");
return 0;
}