Android的,我怎么能字符串转换为日期? [英] Android, How can I Convert String to Date?
问题描述
我存储在数据库中的每一次应用程序启动时用户当前时间。
日历C = Calendar.getInstance();
。字符串str = c.getTime()的toString();
Log.i(当前时间,STR);
在数据库端,我存储当前时间的字符串(如你看到上面的code)。所以,当我从数据库加载它,我需要将其转换为Date对象。我看到一些样品,他们都用了日期格式。但我的格式是完全一样一样的日期格式。所以,我觉得没有必要使用日期格式。我说得对?
反正是有直接施放此字符串Date对象?我想这个存储的时间与当前时间进行比较。
感谢
==> 更新
感谢亲爱的家伙。我用下面的code:
私人布尔isPackageExpired(字符串日期){
布尔isExpired = FALSE;
日期expiredDate = stringToDate(日期,EEE MMMðHH:MM:SS ZZ YYYY);
如果(新的日期()后(expiredDate)。)isExpired = TRUE;
返回isExpired;
}
私人日期stringToDate(字符串A日期,字符串aFormat){
如果(A日期== NULL)返回NULL;
一个ParsePosition POS =新的ParsePosition(0);
SimpleDateFormat的SimpleDateFormat的=新的SimpleDateFormat(aFormat);
日期stringDate = simpledateformat.parse(A日期,POS);
返回stringDate;
}
从字符串到日期
字符串DTSTART =2010-10-15T09:27:37Z;
SimpleDateFormat的格式=新的SimpleDateFormat(YYYY-MM-dd'T'HH:MM:ss'Z');
尝试 {
日期日期= format.parse(DTSTART);
的System.out.println(日期);
}赶上(ParseException的E){
// TODO自动生成的catch块
e.printStackTrace();
}
从日期为字符串
SimpleDateFormat的日期格式=新的SimpleDateFormat(YYYY-MM-dd'T'HH:MM:ss'Z');
尝试 {
日期日期=新的日期();
字符串日期时间= dateFormat.format(日期);
的System.out.println(当前日期时间:+日期时间);
}赶上(ParseException的E){
// TODO自动生成的catch块
e.printStackTrace();
}
I store current time in database each time application starts by user.
Calendar c = Calendar.getInstance();
String str = c.getTime().toString();
Log.i("Current time", str);
In database side, I store current time as string (as you see in above code). Therefore, when I load it from database, I need to cast it to Date object. I saw some samples that all of them had used "DateFormat". But my format is exactly as same as Date format. So, I think there is no need to use "DateFormat". Am I right?
Is there anyway to directly cast this String to Date object? I want to compare this stored time with current time.
Thanks
======> update
Thanks dear guys. I used following code:
private boolean isPackageExpired(String date){
boolean isExpired=false;
Date expiredDate = stringToDate(date, "EEE MMM d HH:mm:ss zz yyyy");
if (new Date().after(expiredDate)) isExpired=true;
return isExpired;
}
private Date stringToDate(String aDate,String aFormat) {
if(aDate==null) return null;
ParsePosition pos = new ParsePosition(0);
SimpleDateFormat simpledateformat = new SimpleDateFormat(aFormat);
Date stringDate = simpledateformat.parse(aDate, pos);
return stringDate;
}
From String to Date
String dtStart = "2010-10-15T09:27:37Z";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
try {
Date date = format.parse(dtStart);
System.out.println(date);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
From Date to String
SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
try {
Date date = new Date();
String datetime = dateFormat.format(date);
System.out.println("Current Date Time : " + datetime);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
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