ios - iOS:将UTC NSDate转换为本地时区

如何在目标C或/和Swift中将UTC NSDate转换为本地时区NSDate？

最佳答案

NSTimeInterval seconds; // assume this exists
NSDate* ts_utc = [NSDate dateWithTimeIntervalSince1970:seconds];

NSDateFormatter* df_utc = [[[NSDateFormatter alloc] init] autorelease];
[df_utc setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
[df_utc setDateFormat:@"yyyy.MM.dd G 'at' HH:mm:ss zzz"];

NSDateFormatter* df_local = [[[NSDateFormatter alloc] init] autorelease];
[df_local setTimeZone:[NSTimeZone timeZoneWithName:@"EST"]];
[df_local setDateFormat:@"yyyy.MM.dd G 'at' HH:mm:ss zzz"];

NSString* ts_utc_string = [df_utc stringFromDate:ts_utc];
NSString* ts_local_string = [df_local stringFromDate:ts_utc];

// you can also use NSDateFormatter dateFromString to go the opposite way

格式化字符串参数表：

https://waracle.com/iphone-nsdateformatter-date-formatting-table/

如果将性能放在首位，则您可能需要考虑使用strftime

https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man3/strftime.3.html

关于ios - iOS:将UTC NSDate转换为本地时区，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/55790777/