iOS 判断某个时间是否处于当天内

根据系统日历获取当天起始时间和结束时间，判断某个时间是否处于当天内。获取的时间为UTC时间，如果需要GMT时间只需要把注释打开

/**
 判断某个时间是否处于当天内
 
 @param date 某个时间
 */
+ (BOOL)validateWithDate:(NSDate *)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *components = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:now];
//    components.hour = 8;
    // 当天起始时间
    NSDate *startDate = [calendar dateFromComponents:components];
    // 当天结束时间
    NSDate *expireDate = [calendar dateByAddingUnit:NSCalendarUnitDay value:1 toDate:startDate options:0];
    
    if ([date compare:startDate] == NSOrderedDescending && [date compare:expireDate] == NSOrderedAscending) {
        return YES;
    } else {
        return NO;
    }
}