1、首先獲取當(dāng)前日期NSDate形式，指定一個(gè)日期格式
#pragma mark -得到當(dāng)前時(shí)間
+(NSDate *)getCurrentTime{
NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
[formatter setDateFormat:@"dd-MM-yyyy-HHmmss"];
NSString *dateTime=[formatter stringFromDate:[NSDate date]];
NSDate *date = [formatter dateFromString:dateTime];
NSLog(@"---------- currentDate == %@",date);
return date;
}
2、然后將指定日期（此處以2016-09-30-00點(diǎn)為例）轉(zhuǎn)換為同樣日期格式，返回NSDate形式
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy-HHmmss"];
NSDate *date = [dateFormatter dateFromString:@"30-09-2016-000000"];
3、最后進(jìn)行比較，將現(xiàn)在的時(shí)間與指定時(shí)間比較，如果沒達(dá)到指定日期，返回-1，剛好是這一時(shí)間，返回0，否則返回1
+(int)compareOneDay:(NSDate *)oneDay withAnotherDay:(NSDate *)anotherDay
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy-HHmmss"];
NSString *oneDayStr = [dateFormatter stringFromDate:oneDay];
NSString *anotherDayStr = [dateFormatter stringFromDate:anotherDay];
NSDate *dateA = [dateFormatter dateFromString:oneDayStr];
NSDate *dateB = [dateFormatter dateFromString:anotherDayStr];
NSComparisonResult result = [dateA compare:dateB];
NSLog(@"date1 : %@, date2 : %@", oneDay, anotherDay);
if (result == NSOrderedDescending) {
//NSLog(@"Date1 is in the future");
return 1;
}
else if (result == NSOrderedAscending){
//NSLog(@"Date1 is in the past");
return -1;
}
//NSLog(@"Both dates are the same");
return 0;
}
調(diào)用
[self compareOneDay:[self getCurrentTime] withAnotherDay:date]
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