Date Utility Methods

Following are different Date utility methods.

1. Code for getting current system time in java.sql.Timestamp format.

public static java.sql.Timestamp todaysSqlDateTime(){
java.util.Date today = new java.util.Date();
java.sql.Timestamp sqlToday = new java.sql.Timestamp(today.getTime());
return sqlToday;
}

2. Code for getting current system time in java.sql.Date format.

public static java.sql.Date todaysSqlDate(){
return new java.sql.Date(Calendar.getInstance().getTimeInMillis());
}

3. Code for getting current system time in java.util.Date format.

public static Date getCurrentSystemDate() {
Date objDate = new Date();
return objDate;
}

4. Code for getting current system time in java.util.Date format.

public static java.util.Date getCurrentSystemDate2() {
java.util.Date objDate = new java.util.Date(Calendar.getInstance().getTimeInMillis());
return objDate;
}

5. Code to convert util.Date to sql.Date.

public static java.sql.Date utilDateTOSQLDate(java.util.Date utilDate) {
java.sql.Date sqlDate = null;
if(utilDate != null){
sqlDate = new java.sql.Date(utilDate.getTime());
}
return sqlDate;
}

6. Code to convert sql.Date.to util.Date

public static Date convertSQLDateTOUtilDate(java.sql.Date sqlDate) {
java.util.Date utilDate=null;
try{
if(sqlDate != null) {
SimpleDateFormat sdf = new SimpleDateFormat("dd-M-yyyy HH:mm:ss");
utilDate = new Date(sqlDate.getTime());
utilDate = sdf.parse(utilDate.toString());
}
}
catch(Exception ex) {
}
return utilDate;
}

7. Code to convert java.util.Date to String Date

public static String convertUtilDateToStringDate(Date objDate) {

DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM);
String usaFormatDate = dateFormat.format(objDate);

return usaFormatDate ;
}

8. Code to convert String Date to java.util.Date

Example of datepattern
"MM/dd/yyyy"
MM/dd/yyyy HH:mm:ss

public static Date stringDateToUtilDate(String stringDate, String datepattern) {

java.util.Date utilDate = null;

try{
if (null != stringDate && !(stringDate.trim().equals("")))
{
SimpleDateFormat formattedDate = new SimpleDateFormat(datepattern);
utilDate = formattedDate.parse(stringDate);
}
}catch(ParseException exception){exception.printStackTrace();}
catch(Exception exception){exception.printStackTrace();}
return utilDate;
}

9. Date subtraction

public static Double compareDates(Date date1, Date date2) {

double difdays = 0.0;
if(date1!= null & date2!= null) {
long difMillSecs = date1.getTime() - date2.getTime();
double difSecs = (double)difMillSecs / 1000.0;
double difMins = difSecs / 60.0;
double difHours = difMins / 60.0;
difdays = difHours/ 24.0;
}
return difdays ;
}

10. Need to know whether Date1 is (after/before) Date2

We can make use of before()/after() methods that are there in java.util.Date class.

The above classes can be found in the following packages
1. java.util.Date
2. java.sql.Date
3. java.sql.Timestamp
4. java.text.DateFormat
5. java.text.SimpleDateFormat