iOS is often used to show code snippets a few hours ago/days ago/months ago/years ago

iOS is often used to show code snippets a few hours ago/days ago/months ago/years ago2015-03-13 10:09
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2. /**
4. * Retain a formated string with a real date string
6. *
8. * @param datestring a real date string, which can be converted to a NSDate object
10. *
12. * @return A string that'll be x minutes ago/x hours ago/yesterday/X days ago/x months ago/x years ago
14. */
16. + (NSString *) timeinfowithdatestring: (NSString *) datestring {
18. //Format the date string as a Date object
20. nsdate *date = [nsdate datefromstring:datestring withformat:@ "Yyyy-mm-dd HH:mm:ss"];
24. nsdate *curdate = [nsdate Date];
26. Nstimeinterval time =-[date timeintervalsincedate:curdate];
30. int month = (int) ([curdate getMonth]-[date getMonth]);
32. int year = (int) ([curdate getYear]-[date getYear]);
34. int day = (int) ([curdate GetDay]-[date GetDay]);
38. Nstimeinterval rettime = 1. 0;
40. //Less than one hour
42. if (Time < 3600) {
44. Rettime = time/ 60;
46. Rettime = Rettime <= 0. 0?  1. 0:rettime;
48. return [NSString stringWithFormat:@ "%.0f minutes ago", Rettime];
50. }
52. //Less than one day, i.e. today
54. Else if (Time < 33600 * 24) {
56. Rettime = time/ 3600;
58. Rettime = Rettime <= 0. 0?  1. 0:rettime;
60. return [NSString stringWithFormat:@ "%.0f hours ago", Rettime];
62. }
64. //Yesterday
66. Else if (Time < 33600 * 2* 2) {
68. return @ "Yesterday";
70. }
72. //The first condition is the same year, and the time interval is within one months
74. //The second condition is an alternate year, for the next year, only last December with this year January this situation
76. Else if ((ABS (year) = = 0 && abs (month) <= 1)
78. || (year) = = 1 && [curdate getMonth] = = 1 && [date getMonth] = = 12)) { /c10>
80. int retday = 0;
82. //Same year
84. if (year = = 0) {
86. //Same month
88. if (month = = 0) {
90. Retday = day;
92. }
94. }
98. if (retday <= 0) {
100. //This is calculated by the maximum monthly value.
102. //Gets the release date, the total number of days in the month
104. int totaldays = [NSDate daysinmonth: (int) [Date GetMonth] year : (int) [date getYear]];
106. //Current days + (the total number of days in the release date-month of the release date, which is equal to the number of days from today)
108. Retday = (int) [Curdate GetDay] + (Totaldays-(int) [date GetDay]);
112. if (retday >= totaldays) {
114. return [NSString stringWithFormat:@ "%d months ago", (ABS) (MAX (Retday/ 31, 1))];
116. }
118. }
122. return [NSString stringWithFormat:@ "%d days ago", (ABS) (Retday)];
124. } Else {
126. if (ABS (year) <= 1) {
128. if (year = = 0) { //
130. return [NSString stringWithFormat:@ "%d months ago", ABS (month)];
132. }
136. //difference of one year
138. int month = (int) [curdate getMonth];
140. int premonth = (int) [date getMonth];
144. //Every other year, but the same month, as a full year to calculate
146. if (month = = 12 && premonth = = 12) {
148. return @ "1 years ago";
150. }
154. //Nor look, but not the same month
156. return [NSString stringWithFormat:@ "%d months ago", (ABS) (12-premonth + month)];
158. }
162. return [NSString stringWithFormat:@ "%d years ago", ABS (year)];
164. }
168. return @ "1 hours ago";
170. }

The number of months before this calculation, in order to reduce the amount of calculation, not to get the total number of days for the corresponding month, but the month maximum value of 31 as the standard, therefore,

If you need more accurate calculations, replace the corresponding small piece of code

iOS is often used to show code snippets a few hours ago/days ago/months ago/years ago