{
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
[gregorian setFirstWeekday:2];
//去掉时分秒信息
NSDate *fromDate;
NSDate *toDate;
[gregorian rangeOfUnit:NSCalendarUnitDay startDate:&fromDate interval:NULL forDate:serverDate];
[gregorian rangeOfUnit:NSCalendarUnitDay startDate:&toDate interval:NULL forDate:endDate];
NSDateComponents *dayComponents = [gregorian components:NSCalendarUnitDay fromDate:fromDate toDate:toDate options:0];
return dayComponents.day;
}
简单方便， 跟实际理解一样。
日期相同就是同一天
日期差一天就是差一天，与是否满24小时无关