Question

java String类型12点转换Date类型怎么是0点

java String类型12点转换Date类型怎么是0点 怎么不是12呢？

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd ");
Date startTime = new Date();
String timeStr = "12:32:00";
timeStr = sdf.format(new Date())+timeStr;
System.out.println("timeStr: " + timeStr);
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
startTime = sdf1.parse(timeStr);
System.out.println("startTime: " + startTime);

Answer 1

hh是12小时制
HH是24小时制

Answer 2

你用的是哪个类。有数据格式，是12点还是24点的

追问

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd ");
Date startTime = new Date();
String timeStr = "12:32:00";
timeStr = sdf.format(new Date())+timeStr;
System.out.println("timeStr: " + timeStr);
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
startTime = sdf1.parse(timeStr);
System.out.println("startTime: " + startTime);

追答

yyyy-MM-dd HH:mm:ss