Android - 时间比较“hh:mm:ss a"格式 [英] Android - Time Comparison "hh:mm:ss a" format

问题描述

我尝试以hh:mm:ss a"格式比较两次.但它并没有按照我的想法真正起作用.我用谷歌搜索但找不到正确的答案.抱歉，因为我是编程新手."

"I try to compare two time in "hh:mm:ss a" format. But it not really work in what I think. I googled but couldn't find a proper answer. Sorry cause I'm new to programming."

我尝试像这样比较时间:

I try to compare the time like this:

String strSQL = "SELECT * FROM " + TABLE_SCHEDULE + " WHERE lecturer_id=? AND schedule_day=? AND schedule_endtime > ?";

schedule_endtime > ?

然而，比较忽略了 AM/PM 导致结果变成这样:例如.12:00:00 PM 大于 02:00:00 PM.

However, the comparison has ignored the AM/PM which caused the result become like this: eg. 12:00:00 PM is bigger than 02:00:00 PM.

希望大家能给点建议或者提供一些解决方案.欣赏一下.

Hope that you all can give some tips or provide some solution. Appreciate it.

推荐答案

不是比较格式化的字符串，而是比较以毫秒为单位的值.看看这个 将字符串转换回日期:

Instead of comparing the formatted string, compare the value in milliseconds. Take a look at this to convert the string back to date:

SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy");
String dateInString = "7-Jun-2013";

try {

    Date date = formatter.parse(dateInString);
    System.out.println(date);
    System.out.println(formatter.format(date));

} catch (ParseException e) {
    e.printStackTrace();
}

然后一旦你有两个日期，你就可以像这样比较它们:

Then once you have two dates you can compare them like so:

 boolean before = someDate.before(anotherDate);

或

 boolean after = someDate.after(anotherDate);

甚至

 someDate.getTime() < anotherDate.getTime();

旁注:当我存储日期时，我喜欢只存储毫秒值和时区.这样你就不用担心这样的事情了.

Side note: when I store dates, I like to just store the millisecond value and the time zone. That way you don't need to worry about things like this.

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