1. Servlet Date Operations

2. Getting date from the user
Through HTML Form
Since we are using bootstrap, date input must use bootstrap standard gui
One of the plugins out there
bootstrap-datetimepicker.min.js
Jquery bootstrap date picker
Can format the input
MY format – mm-dd-yyyy

3. MYSQL DATE DATE DATETIME Conversion is needed
Yyyy-mm-dd
DATETIME
Yyyy-mm-dd hh:mm:ss – NOW | current time and date
Conversion is needed
From dd-mm-yyyy to yyyy-mm-dd

4. Java string to date conversion
String input from html form must be parsed into a java date object.
//convert string to date
String traveldate = request.getParameter("traveldate");
SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy");
Date date = new Date();
try {
date = formatter.parse(traveldate); }
catch (Exception ex) { }

5. MY to mysql format conversion
//convert to mysql date
formatter = new SimpleDateFormat("yyyy-MM-dd");
traveldate = formatter.format(date);

6. NOW() function for mysql
Exist in php for getting the current time and date
Usually use to capture transaction date
NOW() funtion not exist in Java
Need to do manually

7. Current time and date in Java
//get current date and time
Date currentdate = new Date();
//format directly to mysql date
SimpleDateFormat formatter =
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String bookingdate = formatter.format(currentdate);

8. MYSQL TO JAVA DATE CONVERSION
MYSQL DATE TO JAVA DATE
//yyyy-MM-dd
String traveldate = rs.getString("traveldate");
//convert traveldate string to date (still mysql date)
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date();
try {
date = formatter.parse(traveldate);
} catch (Exception ex) {}

9. //convert mysql date to MY date formatter = new SimpleDateFormat("dd-MM-yyyy"); traveldate = formatter.format(date);

10. MYSQL TO JAVA DATE CONVERSION
MYSQL DATETIME TO JAVA DATETIME
//yyyy-MM-dd HH:mm:ss
//parse the date from string for date conversion
String bookingdate = rs.getString("bookingdate");
formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
date = new Date();
try {
date = formatter.parse(bookingdate);
} catch (Exception ex) {}

11. //convert to MY format dd-MM-yyyy formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss a"); //formatter = new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss a"); //formatter = new SimpleDateFormat("dd MMMM, yyyy HH:mm:ss a"); bookingdate = formatter.format(date); a – AM/PM LET SAY MONTH IS NOVEMBER MM – 11 MMM – NOV MMMM – NOVEMBER