如何计算给定日期的剩余天数、小时数、分钟数和秒数?
Posted
技术标签:
【中文标题】如何计算给定日期的剩余天数、小时数、分钟数和秒数?【英文标题】:How to calculate remaining Days, Hours, Mins and seconds from given date? 【发布时间】:2017-01-25 12:53:15 【问题描述】:在我的应用程序中,我需要获取来自 JSON 响应的给定日期的天数、小时数、分钟数和秒数。以下是我得到的日期和时间:
"date_time" = "2017-01-31 08:30:00";
并且需要计算剩余天数:6小时:18分钟:24秒:30
结束日期将是今天的日期。我尝试了下面的代码,但它给了我几天的负数(我认为它需要 UTC 时区)并且还尝试了很多关于 SO 的答案。
NSString *start = [[self.eventsArray valueForKey:@"date_time"]objectAtIndex:0];
NSDateFormatter *date = [[NSDateFormatter alloc] init];
[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *end = [date stringFromDate:[NSDate date]];
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *startDate = [f dateFromString:start];
NSDate *endDate = [f dateFromString:end];
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorianCalendar components:NSCalendarUnitDay
fromDate:startDate
toDate:endDate
options:0];
NSLog(@"day : %ld H: %ld M : %ld S:%ld", [components day], (long)[components hour],(long)[components minute],(long)[components second]);
请有人帮我困住。
【问题讨论】:
startDate 和 endDate 的值为 dateFromString:start 和 end 将是今天的日期。 看看NSDateComponentsFormatter
。
【参考方案1】:
您在这里犯了错误,您的fromDate
应该是今天的日期,即[NSDate date]
,而toDate
将是您的startDate
。所以你的代码应该是这样的。
NSString *end = [[self.eventsArray valueForKey:@"date_time"]objectAtIndex:0];
NSDateFormatter *date = [[NSDateFormatter alloc] init];
[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
//Start date
NSDate *startDate = [NSDate date];
NSDate *endDate = [f dateFromString:end];
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorianCalendar components:NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond
fromDate:startDate
toDate:endDate
options:0];
NSLog(@"day : %ld H: %ld M : %ld S:%ld", [components day], (long)[components hour],(long)[components minute],(long)[components second]);
【讨论】:
你的意思是说'NSDate *startDate = [f dateFromString:start]; NSDate *endDate = [f dateFromString:end];' @Nij 您的起始日期是今天的日期,这样您就可以获得铰削天数。 @Nij 您还需要添加小时分钟和秒的组件,检查已编辑的答案。 感谢您的关注,这是我的错误,仍然得到这样的结果 'day : 5 H: 9223372036854775807 M : 9223372036854775807 S:9223372036854775807' 成功了 :) 我可以知道如何将该值更新为 tableviewcell 的标签吗?【参考方案2】:调用下面的方法并传递你的日期
+(NSMutableString*) timeLeftSinceDate: (NSDate *) dateT
NSMutableString *timeLeft = [[NSMutableString alloc]init];
NSDate *today10am = [NSDate date];
today10am = [self getPickerDateForString:[self getPickerDateForDate:today10am]];
NSInteger seconds = [today10am timeIntervalSinceDate:dateT];
NSInteger days = (int) (floor(seconds / (3600 * 24)));
if(days) seconds -= days * 3600 * 24;
NSInteger hours = (int) (floor(seconds / 3600));
if(hours) seconds -= hours * 3600;
NSInteger minutes = (int) (floor(seconds / 60));
if(minutes) seconds -= minutes * 60;
if(days)
[timeLeft appendString:[NSString stringWithFormat:@"%ld Days ago", (long)days]];
else if(hours)
[timeLeft appendString:[NSString stringWithFormat: @"%ld h ago", (long)hours]];
else if(minutes)
[timeLeft appendString: [NSString stringWithFormat: @"%ld m ago",(long)minutes]];
else if(seconds)
[timeLeft appendString:[NSString stringWithFormat: @"Just now"]];
return timeLeft;
+ (NSString *)getPickerDateForDate:(NSDate *)dateVal
NSString * stringVal;
if (!dateFormatter)
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
dateFormatter.timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
stringVal = [dateFormatter stringFromDate:dateVal];
return stringVal;
+ (NSDate *)getPickerDateForString:(NSString *)dateString
NSDate * stringVal;
if (!dateFormatter)
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
dateFormatter.timeZone = [NSTimeZone systemTimeZone];
stringVal = [dateFormatter dateFromString:dateString];
return stringVal;
【讨论】:
以上是关于如何计算给定日期的剩余天数、小时数、分钟数和秒数?的主要内容,如果未能解决你的问题,请参考以下文章
ActionScript 3.0 + 计算两个日期之间的时间跨度?
第六章第二十五题(将毫秒数转换成小时数分钟数和秒数)(Convert milliseconds to hours, minutes, and seconds) - 编程练习题答案
第六章第二十五题(将毫秒数转换成小时数分钟数和秒数)(Convert milliseconds to hours, minutes, and seconds) - 编程练习题答案
MySql计算两日期时间之间相差的天数,秒数,分钟数,周数,小时数