1.首先获取当前时间的字符串
+ (NSString *)getCurrentTime{
NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSString *dateTime=[formatter stringFromDate:[NSDate date]];
return dateTime;
}
2.将指定的时间戳按相同的格式（例如：yyyy-MM-dd HH:mm:ss），转化为字符串
3.将当前时间oneDay与指定时间anotherDay进行对比
①如果result == NSOrderedDescending，说明当前时间大于指定时间
②如果result == NSOrderedAscending，说明当前时间小于指定时间
③如果以上两种都不是，说明当前时间与指定时间相同
+ (int)compareOneDay:(NSString *)oneDay withAnotherDay:(NSString *)anotherDay
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *dateA = [dateFormatter dateFromString:oneDay];
NSDate *dateB = [dateFormatter dateFromString:anotherDay];
NSComparisonResult result = [dateA compare:dateB];
if (result == NSOrderedDescending) {
//NSLog(@"DateA is in the future");
return 1;
}
else if (result == NSOrderedAscending){
//NSLog(@"DateA is in the past");
return -1;
}else{
//NSLog(@"Both dates are the same");
return 0;
}
}
