不說前言向图，上來就干記錄一下
//得到當(dāng)前的時間
NSDate * mydate = [NSDate date];
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];
DebugLog(@"---當(dāng)前的時間的字符串 =%@",currentDateStr);
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = nil;
comps = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitMonth fromDate:mydate];
NSDateComponents *adcomps = [[NSDateComponents alloc] init];
[adcomps setYear:0];
[adcomps setMonth:-2];
[adcomps setDay:0];
NSDate *newdate = [calendar dateByAddingComponents:adcomps toDate:mydate options:0];
NSString *beforDate = [dateFormatter stringFromDate:newdate];
DebugLog(@"---前兩個月 =%@",beforDate);
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