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Finding the number of days between 2 dates in java |
To get the difference between two dates, the key thing is to turn them into "longs" using the gettime function - an example method is shown below.
public void printDaysBetweenDates()
{
// Create two dates
GregorianCalendar cal1 = new GregorianCalendar(2020, 10, 5); // set to
// 5Nov2020
GregorianCalendar cal2 = new GregorianCalendar(); // Set to now
System.out.println("First Date is " + cal1.getTime());
System.out.println("Second Date is " + cal2.getTime());
long mils = (cal1.getTimeInMillis() - cal2.getTimeInMillis());
long days = Math.abs(mils / 1000 / 60 / 60 / 24);
System.out.println("The number of days is " + days);
}
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Getting the current date in java |
To get the current date in java then use the gettime() method
here is an example method
public void printCurrentDate()
{
Date theDate = new GregorianCalendar().getTime();
System.out.println("The current date is " + theDate);
}
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parsing a text date in java |
To parse a text date in java you first need to create a SimpleDateFormat object with the pattern matching the format that the date is in, then just use the parse function to complete the parse.
The following method gives an example
public void parseDateFromString()
{
String convDate = "21/03/2009";
SimpleDateFormat format = new SimpleDateFormat("d/M/y");
try {
Date theDate = format.parse(convDate);
System.out.println("The date to parse was " + convDate);
System.out.println("The parsed date was " + theDate);
} catch (ParseException pe) {
System.out.println("Couldnt parse the date Error: " + pe);
}
}
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