我在更改日期格式时收到错误的日期，我正在使用以下代码
NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"MMM dd, YYYY"];
NSDate * theDate = [NSDate dateWithTimeIntervalSince1970:1419929948.7490001];
NSString * dateStr = [formatter stringFromDate:theDate];
输出-
theDate is : 2014-12-30 08:59:08 +0000
dateStr is : Dec 30, 2015
谢谢
最佳答案
您想使用 yyyy 而不是 YYYY。小写的 y 是日历年，而大写的 Y 是“一年中的一周”的年份。
下面是来自the specification的解释.
F.4 Week of Year
Values calculated for the Week of Year field range from 1 to 53 for the Gregorian calendar (they may have different ranges for other calendars). Week 1 for a year is the first week that contains at least the specified minimum number of days from that year. Weeks between week 1 of one year and week 1 of the following year are numbered sequentially from 2 to 52 or 53 (if needed). For example, January 1, 1998 was a Thursday. If the first day of the week is MONDAY and the minimum days in a week is 4 (these are the values reflecting ISO 8601 and many national standards), then week 1 of 1998 starts on December 29, 1997, and ends on January 4, 1998. However, if the first day of the week is SUNDAY, then week 1 of 1998 starts on January 4, 1998, and ends on January 10, 1998. The first three days of 1998 are then part of week 53 of 1997.
关于ios - 在更改日期格式时得到错误的日期，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28063105/