1. The Calendar to convert a String

 // Get the current time, such as year, month, day,week,date, minute, and second
        Calendar calendat = Calendar.getInstance();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdf.format(calendar.getTime());
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2. The String into the Calendar

String str="2010-5-27";
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

Date date =sdf.parse(str);

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);
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3. The Date String

SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

String dateStr=sdf.format(new Date());
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4. The String into the Date

String str="2010-5-27";

SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

Date birthday = sdf.parse(str);
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5. The Date into the Calendar

Calendar calendar = Calendar.getInstance();
calendar.setTime(new java.util.Date());
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6. The Calendar Date

Calendar calendar = Calendar.getInstance();
java.util.Date date =calendar.getTime();
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Insert data from oracle table DATE as an example


SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HHmmss");
    String date = sdf.format(new Date()); 

    -----------------------------------------

     String sql = "Insert into SM_SEND (*****************) " +
                  "values (******************************* "',1," + "to_date('" +date+ "', 'YYYY-MM-DD HH24:MI:SS')" + "," + "to_date('" +date+ "', 'YYYY-MM-DD HH24:MI:SS')" + ",0,null,null,null,null,null,null,null)";Copy the code