时间与NSString转换
//传进来时间字符串转换
+ (NSString *) getChatTimeString:(NSString *)timeString {
if (timeString==nil || timeString.length==0 || [timeString isEqualToString:@"0"]||timeString.length < 10) {
#warning XXX
return @"";
}
/**将字符串转换成时间*/
NSDate *timeDate = [CommonFunction getCurrentStringAsDate:timeString];
NSTimeInterval secondsPerDay = 24 * 60 * 60;
NSDate *date = [NSDate date];
NSDate *qian = [date dateByAddingTimeInterval: - 2 * secondsPerDay];
NSDate *yesterday = [date dateByAddingTimeInterval: -secondsPerDay];
NSString * todayString = [[date description] substringToIndex:10];
NSString * yesterdayString = [[yesterday description] substringToIndex:10];
NSString * qianString = [[qian description] substringToIndex:10];
NSString * dateString = [[timeDate description] substringToIndex:10];
NSString *year1 = [todayString substringWithRange:NSMakeRange(0, 4)];
NSString *year2 = [timeString substringWithRange:NSMakeRange(0, 4)];
if ([dateString isEqualToString:todayString]&& timeString.length>=16)//是否等于今天
{
// return [timeString substringWithRange:NSMakeRange(11, 5)];
return [NSString stringWithFormat:@"今天 %@",[timeString substringWithRange:NSMakeRange(11, 5)]];
} else if ([dateString isEqualToString:yesterdayString])//是否等于昨天
{
return [NSString stringWithFormat:@"昨天 %@",[timeString substringWithRange:NSMakeRange(11, 5)]];
}else if ([dateString isEqualToString:qianString])//是否等于前天
{
return [NSString stringWithFormat:@"前天 %@",[timeString substringWithRange:NSMakeRange(11, 5)]];
}
else
{
if (![year1 isEqualToString:year2]) {
return timeString;
}
return [timeString substringWithRange: NSMakeRange(5, 11)];
}
//系统时间转换
+ (NSDate *) getCurrentStringAsDate:(NSString *)date {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat: @"YYYY-MM-dd HH:mm"];
NSDate *dateString = [dateFormatter dateFromString:date];
return dateString;
}
//获取当前时间日期,返回字符串
+ (NSString *) getCurrentDateAsString {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat: @"YYYY-MM-dd HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate: [NSDate date]];
return dateString;
}
