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NSString *string = [NSDateFormatter dateFormatFromTemplate:@"j" options:0 locale:[NSLocale currentLocale]];
NSRange range = [string rangeOfString:@"a"];
BOOL hasAMPM = range.location != NSNotFound;
hasAMPM = true 表示当前时间为12 小时制 相反 为24小时制
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原文地址:http://www.cnblogs.com/deneyZhao/p/5473347.html