main.m
1 #import <Foundation/Foundation.h>
2 /**
3 * 根据输入的时间，获取对应月份的天数
4 *
5 * @param currentDate 输入的时间
6 *
7 * @return 对应月份的天数
8 */
9 NSUInteger daysOfMonth(NSDate *currentDate) {
10 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
11 NSRange range = [gregorian rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:currentDate];
12 return range.length;
13 }
14 /**
15 * 根据输入的时间，获取对应年份的天数
16 *
17 * @param currentDate 输入的时间
18 *
19 * @return 对应年份的天数
20 */
21 NSUInteger daysOfYear(NSDate *currentDate) {
22 NSUInteger days = 0;
23 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
24 NSDateComponents *comps = [gregorian components:NSCalendarUnitYear fromDate:currentDate];
25
26 for (NSUInteger i=1; i<=12; i++) {
27 [comps setMonth:i];
28 days += daysOfMonth([gregorian dateFromComponents:comps]);
29 }
30 return days;
31 }
32 /**
33 * 根据输入的时间，获取对应月份的第一天时间
34 *
35 * @param currentDate 输入的时间
36 *
37 * @return 对应月份的第一天时间
38 */
39 NSDate* firstDayOfMonth(NSDate *currentDate) {
40 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
41 unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
42 NSDateComponents *comps = [gregorian components:unitFlags fromDate:currentDate];
43 [comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; //使用UTC或GMT解决时区相差8小时的问题
44 [comps setDay:1];
45
46 NSDate *firstDay = [gregorian dateFromComponents:comps];
47 return firstDay;
48 }
49 /**
50 * 根据输入的时间，获取对应月份的最后一天时间
51 *
52 * @param currentDate 输入的时间
53 *
54 * @return 对应月份的最后一天时间
55 */
56 NSDate* lastDayOfMonth(NSDate *currentDate) {
57 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
58 unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
59 NSDateComponents *comps = [gregorian components:unitFlags fromDate:currentDate];
60 [comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; //使用UTC或GMT解决时区相差8小时的问题
61 [comps setDay:daysOfMonth(currentDate)];
62
63 NSDate *lastDay = [gregorian dateFromComponents:comps];
64 return lastDay;
65 }
66 /**
67 * 根据输入的时间和添加的月数间隔、天数间隔，获取间隔后的时间
68 *
69 * @param currentDate 输入的时间
70 * @param months 月数间隔
71 * @param days 天数间隔
72 *
73 * @return 间隔后的时间
74 */
75 NSDate* addMonthAndDayToDate(NSDate *currentDate, NSUInteger months, NSUInteger days) {
76 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
77 NSDateComponents *comps = [[NSDateComponents alloc] init];
78 [comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; //使用UTC或GMT解决时区相差8小时的问题
79 [comps setMonth:months];
80 [comps setDay:days];
81
82 NSDate *newDate = [gregorian dateByAddingComponents:comps toDate:currentDate options:0];
83 return newDate;
84 }
85 /**
86 * 根据输入的开始时间和结束时间，获取间隔的时间数组（月数和天数；toDate-fromDate的比较值是有符号整数NSInteger，所以存在负数的可能）
87 *
88 * @param fromDate 开始时间
89 * @param toDate 结束时间
90 *
91 * @return 间隔的时间数组（月数和天数；toDate-fromDate的比较值是有符号整数NSInteger，所以存在负数的可能）
92 */
93 NSArray* monthAndDayBetweenTwoDates(NSDate *fromDate, NSDate *toDate) {
94 NSMutableArray *mArrMonthAndDay = [[NSMutableArray alloc] initWithCapacity:2];
95 NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
96 unsigned unitFlags = NSCalendarUnitMonth | NSCalendarUnitDay;
97 NSDateComponents *comps = [gregorian components:unitFlags fromDate:fromDate toDate:toDate options:0];
98
99 [mArrMonthAndDay addObject:[NSString stringWithFormat:@"%ld", (long)[comps month]]];
100 [mArrMonthAndDay addObject:[NSString stringWithFormat:@"%ld", (long)[comps day]]];
101 return mArrMonthAndDay;
102 }
103 int main(int argc, const char * argv[]) {
104 @autoreleasepool {
105 NSDate *now = [NSDate date];
106 NSUInteger days = daysOfMonth(now);
107 NSLog(@"本月的天数=%lu", (unsigned long)days); //本月的天数=30
108
109 days = daysOfYear(now);
110 NSLog(@"本年的天数=%lu", (unsigned long)days); //本年的天数=365
111
112 NSDate *firstDay = firstDayOfMonth(now);
113 NSLog(@"firstDayOfMonth=%@", firstDay); //firstDayOfMonth=2015-04-01 00:58:39 +0000
114
115 NSDate *lastDay = lastDayOfMonth(now);
116 NSLog(@"lastDayOfMonth=%@", lastDay); //lastDayOfMonth=2015-04-30 00:58:39 +0000
117
118 NSDate *newDate = addMonthAndDayToDate(lastDay, 0, 2);
119 NSLog(@"lastDayOfMonth的后天=%@", newDate); //lastDayOfMonth的后天=2015-05-02 00:58:39 +0000
120
121 newDate = addMonthAndDayToDate(lastDay, 2, 2);
122 NSLog(@"lastDayOfMonth的2个月零2天后时间=%@", newDate); //lastDayOfMonth的2个月零2天后时间=2015-07-02 00:58:39 +0000
123
124 NSArray *arrMonthAndDay = monthAndDayBetweenTwoDates(firstDay, newDate);
125 NSLog(@"lastDayOfMonth的2个月零2天后时间和firstDayOfMonth相差（%@个月零%@天）", arrMonthAndDay[0], arrMonthAndDay[1]); //lastDayOfMonth的2个月零2天后时间和firstDayOfMonth相差（3个月零1天）
126 }
127 return 0;
128 }
结果：
1 2015-04-30 00:58:39.794 OCNSCalendar[988:83921] 本月的天数=30 2 2015-04-30 00:58:39.795 OCNSCalendar[988:83921] 本年的天数=365 3 2015-04-30 00:58:39.800 OCNSCalendar[988:83921] firstDayOfMonth=2015-04-01 00:58:39 +0000 4 2015-04-30 00:58:39.800 OCNSCalendar[988:83921] lastDayOfMonth=2015-04-30 00:58:39 +0000 5 2015-04-30 00:58:39.800 OCNSCalendar[988:83921] lastDayOfMonth的后天=2015-05-02 00:58:39 +0000 6 2015-04-30 00:58:39.800 OCNSCalendar[988:83921] lastDayOfMonth的2个月零2天后时间=2015-07-02 00:58:39 +0000 7 2015-04-30 00:58:39.800 OCNSCalendar[988:83921] lastDayOfMonth的2个月零2天后时间和firstDayOfMonth相差（3个月零1天）
时间： 2024-08-27 10:07:20