Objective c 检查两个日期是否相隔一个月
我在检查两个日期是否相隔一个月。我读到我应该使用这个方法Objective c 检查两个日期是否相隔一个月,objective-c,nsdate,nscalendar,nsdatecomponents,Objective C,Nsdate,Nscalendar,Nsdatecomponents,我在检查两个日期是否相隔一个月。我读到我应该使用这个方法组件:fromDate:toDate:options:fromNSCalendar 我的代码 #define FORMAT_DATE_TIME @"dd-MM-yyyy HH:mm" NSDate *updateDate = [Utils getDateFromString:airport.updateOn withFormat:FORMAT_DATE_TIME]; NSDate *now = [NSDate date]; NSStrin
组件:fromDate:toDate:options:
fromNSCalendar
我的代码
#define FORMAT_DATE_TIME @"dd-MM-yyyy HH:mm"
NSDate *updateDate = [Utils getDateFromString:airport.updateOn withFormat:FORMAT_DATE_TIME];
NSDate *now = [NSDate date];
NSString *nowString = [Utils getStringFromDate:now withFormat:FORMAT_DATE_TIME];
now = [Utils getDateFromString:nowString withFormat:FORMAT_DATE_TIME];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [calendar components:NSCalendarUnitMonth fromDate:updateDate toDate:now options:0];
NSLog(@"%ld", (long)[comps year]);
NSLog(@"%ld", (long)[comps month]);
NSLog(@"%ld", (long)[comps day]);
以下是日志:
(内陆开发银行)年份:9223372036854775807
(lldb)月份:0
(lldb)日:9223372036854775807
(lldb)po now 2017-08-23 11:54:00+0000
(lldb)采购订单更新日期2017-08-23 11:48:00+0000
不是所有的值都应该为零吗?下一行不包括年(
NSCalendarUnitYear
)和日(NSCalendarUnitDay
)组件,只包括月(NSCalendarUnitMonth
)组件
NSDateComponents *components = [calendar components:NSCalendarUnitMonth fromDate:updateDate toDate:now options:0];
添加NSCalendarUnitYear
和NSCalendarUnitDay
以将[comps year]和[comps day]设置为0
像这样:
NSDateComponents * components = [calendar components:NSCalendarUnitMonth |NSCalendarUnitYear|NSCalendarUnitDay fromDate:updateDate toDate:now options:0];
你可以用这个
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:FORMAT_DATE_TIME];
NSDate *updateDate = [dateFormatter dateFromString:@"24-07-1990 15:20"];
NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
NSDateComponents *comps = [calendar components:unitFlags fromDate:updateDate toDate:now options:0];
NSLog(@"%ld", (long)[comps year]);
NSLog(@"%ld", (long)[comps month]);
NSLog(@"%ld", (long)[comps day]);
我认为这是默认的“unset”值(相当于2^63-1)。如果打印
NSDateComponents
is,则可能无法打印年份和日期,因为您没有在组件:fromDate:toDate:options:
中请求它。您不需要将日期转换为字符串或从字符串转换为日期。不,不应该。这只是未初始化的变量,其中的值是不可预测的,不应该被引用。@bruno再次检查我第一次没有很好地阅读你的问题