CODEWITHSUNDEEP
javaandroidtimecalendar
XtreemDeveloper
XtreemDeveloper

Reputation: 1142

How to compare AM/PM time in Android

I have a scenario

start-time = 4:15 PM
end-time = 2:00 AM

if my current-time (let say 9:15 PM in the same format as start or end time) fall between start-time and end-time then goto screen 1 other wise goto screen 2

My question is how do I compare current-time greater or equals to 'start-time' and less or equals to 'end-time'. I have tried by converting given time values into milliseconds and compare it but the current-time = 9:15 PM is appeared to be greater than 'end-time = 2:00 AM', as 2:00 AM will come after mid night means if `9:15 PM day = Thursday then 2:00 AM will be the Friday'. I have searching a lot but can't figure it out. Any type of help will be appreciated.

EDITED:

current-time, start-time and end-time all values taken to be as String

EDIT 2

code spinet: 

long currentTime = getMillis("9:15 PM");

long startTime = getMillis("4:15 PM");

long endTime = getMillis("2:00 AM");//this will be the next day's time confusing part for me

if(currentTime >= startTime && currentTime <= endTime)
{
   //goto screen 1
}
else
{
  // goto screen 2
}


private long getMillis(String givenTime)
{
   SimpleDateFormat sdf = new SimpleDateFormat("h:mm a");
try {
    Date mDate = sdf.parse(givenTime);
    long timeInMilliseconds = mDate.getTime();
    System.out.println("Date in milli :: " + timeInMilliseconds);
    return timeInMilliseconds;
} catch (ParseException e) {
            e.printStackTrace();
}
return 0;
}

Upvotes: 2

Views: 6304

Answers (5)

Basil Bourque
Basil Bourque

Reputation: 339053

Use a date-time library that supports a time-only value without a date or time zone.

In the Java world, we have two good date-time libraries: Joda-Time and java.time (bundled with Java 8, inspired by Joda-Time, defined by JSR 310). Both libraries offer a LocalTime class.

Joda-Time

Here is some untested code in Joda-Time 2.4 to get you in the right direction.

String inputStart = "4:15 PM";
String inputStop = "2:00 AM";

DateTimeFormatter formatter = DateTimeFormat.forPattern( "h:mm a" );
LocalTime start = formatter.parseLocalTime( inputStart );
LocalTime stop = formatter.parseLocalTime( inputStop );
String now = LocalTime.now( DateTimeZone.forID( "America/Montreal" ) );

boolean isNowInRange = false;
if( start.isEqual( stop ) ) {
    isNowInRange = ( now.isEqual( start ) );
} else if ( start.isBefore( stop ) ) {
    isNowInRange = ( ( now.isEqual( start ) || now.isAfter( start ) ) && now.isBefore( stop ) );
} else if ( start.isAfter( stop ) ) {
    isNowInRange = ( ( now.isEqual( start ) || now.isAfter( start ) ) || now.isBefore( stop ) );
} else {
    // FIXME: Handle this supposedly impossible case.
}

Upvotes: 1

Mehul Joisar
Mehul Joisar

Reputation: 15358

Step 1: You simply need to add a day to your end time when it is lower than your start time.

Step 2: Apply your conditions to check whether current time falls in between start time and end time or not

    try {
        Date mToday = new Date();

        SimpleDateFormat sdf = new SimpleDateFormat("hh:mm aa");
        String curTime = sdf.format(mToday);
        Date start = sdf.parse("4:15 PM");
        Date end = sdf.parse("2:00 AM");
        Date userDate = sdf.parse(curTime);

        if(end.before(start))
        {
            Calendar mCal = Calendar.getInstance();
            mCal.setTime(end);
            mCal.add(Calendar.DAY_OF_YEAR, 1);
            end.setTime(mCal.getTimeInMillis());
        }

        Log.d("curTime", userDate.toString());
        Log.d("start", start.toString());
        Log.d("end", end.toString());


        if (userDate.after(start) && userDate.before(end)) {
            Log.d("result", "falls between start and end , go to screen 1 ");
        }
        else{
            Log.d("result", "does not fall between start and end , go to screen 2 ");
        }
    } catch (ParseException e) {
        // Invalid date was entered
    }

Upvotes: 8

Kushal Sharma
Kushal Sharma

Reputation: 5973

Here is a sample code to get the current date int timestamp(long millisec)

   Long dateTs;
    Date dateToday = new Date();
    String s = dateToday.toString();
    s = s.substring(4, 10) + ", " + s.substring(30, 34);
    try {
        Date date = new SimpleDateFormat("MMMM d, yyyy", Locale.ENGLISH)
                .parse(s);
        dateTs = date.getTime();   // today 00:00 hours
    } catch (ParseException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

Similarly, you can get timestamp for any datetime you want

and then simply compare timestamp with if else from current date.. i can explan more if you feel need for.

Upvotes: 0

TheLostMind
TheLostMind

Reputation: 36304

From the top of my head, you could do this. You are lazy (some small code would do this), so am I

  1. if start time contains "AM" and current time contains "AM", then just check for values of both to know which one is bigger.

  2. If 1 is true, then if end-time is pm, then return true. Else, check if current time < end time and return true/false.

PS : Follow the same approach if you have PM in case-1. Also, this is certainly, not a good way of achieving what you want.

Upvotes: 0

Sagar Pilkhwal
Sagar Pilkhwal

Reputation: 3993

try this:

Date dt = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("hh:mm aa");
String curTime = sdf.format(dt);
Date start = parser.parse("4:15 PM");
Date end = parser.parse("2:00 AM");

try {
    Date userDate = parser.parse(curTime);
    if (userDate.after(start)){
      ....
      //you can have your if...else if... conditions 
    }
    if(userDate.before(end)) {
        ....
    }
} catch (ParseException e) {
    // Invalid date was entered
}

Upvotes: 4

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