Question

I have two datetime values and i dont knw how to compare them. I know if i had only date values then before() and after() methods would have worked but i have no idea about Datetime values. All i have done is below plz tell me if its correct ?? and plz do guide me if its not a good way and a better alternative is available.

Date now = new Date();
DateTime currenttime = new DateTime(now, TimeZone.getTimeZone("IST"));
DateTime edate = e.getEnd().getDateTime();                 
if(currenttime.getValue()>edate.getValue())
{
       //here I want to do the logic to delete this event.         
}

e refers to the event object that is of google calendar. All i want to do here is check if Event e is past todays date and time. and if it is then i wanna delete the event.

Answer 1

You can use jdk Calendar to get and check days:

public boolean isDatePass(Date date) {
    Calendar calendar = Calendar.getInstance();

    // Getting day of year and year of checked date:
    calendar.setTime(date);
    int checkedYear = calendar.get(Calendar.YEAR);
    int checkedDay = calendar.get(Calendar.DAY_OF_YEAR);

    // Getting day of year and year of current date:
    calendar.setTime(new Date());
    int currentYear = calendar.get(Calendar.YEAR);
    int currentDay = calendar.get(Calendar.DAY_OF_YEAR);

    if(checkedYear != currentYear) {
        return checkedYear < currentYear;
    }

    return checkedDay < currentDay;

}

For yoda DateTime:

public boolean isDatePass(DateTime date) {
    // Getting day of year and year of checked date:
    int checkedYear = date.getYear();
    int checkedDay = date.getDayOfYear();

    // Getting day of year and year of current date:
    DateTime currentTime = new DateTime(now, TimeZone.getTimeZone("IST"));
    int currentYear = currentTime.getYear();
    int currentDay = currentTime.getDayOfYear();

    if(checkedYear != currentYear) {
        return checkedYear < currentYear;
    }

    return checkedDay < currentDay;

}

Not days only but time:

public boolean isDatePass(DateTime date) {

    DateTime currentTime = new DateTime(now, TimeZone.getTimeZone("IST"));
    return date.isAfter(currentTime);
}

More simple solution (according to javadoc when pass null to isAfter/isBefore this mean current or now):

public boolean isDatePass(DateTime date) {
    return date.isAfter(null); // but it does not take in account time zone
}