Convert datetime, sunrise and sunset from miliseconds to real time format

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Java

Android

DateTime

My weather App displays Datetime(last updated), Sunrise, and Sunset data from OpenWeatherMap in the form of milliseconds(i.e 1620792785). I'm trying to convert it to a real-time format (i.e hh:mm a).

So I want to:

- Convert the dt accurately

- Convert Sunrise and Sunset time accurately using the right codes and classes.

My app can search for any city, so I'm not getting for a particular timezone but for all cities.



My Example class: (for dt, sunrise & sunset specifically)

public class Example {
    
    @SerializedName("dt")
    private Integer dt;
    

   

    public Integer getDt() {
        return dt;
    }

    public void setDt(Integer dt) {
        this.dt = dt;
    }

    

    

    public class Coord {

        @SerializedName("lon")
        private Double lon;
        @SerializedName("lat")
        private Double lat;

        public Double getLon() {
            return lon;
        }

        public void setLon(Double lon) {
            this.lon = lon;
        }

        public Double getLat() {
            return lat;
        }

        public void setLat(Double lat) {
            this.lat = lat;
        }

    }

    

    public class Sys {

        
        @SerializedName("sunrise")
        private Integer sunrise;
        @SerializedName("sunset")
        private Integer sunset;

        

        public Integer getSunrise() {
            return sunrise;

        }

        public void setSunrise(Integer sunrise) {
            this.sunrise = sunrise;
        }

        public Integer getSunset() {
            return sunset;

        }

        public void setSunset(Integer sunset) {
            this.sunset = sunset;
        }

    }

    

    public String getPrettyDate() {
        SimpleDateFormat HMM = new SimpleDateFormat("hh:mm a", Locale.US);
        final Date date = new Date(dt*1000);
        return HMM.format(date);
    }
}

My Activity class(Where I called dt):

time_field.setText("Last Updated:" + " " + response.body().getPrettyDate());

My FirstFragment class(Where I called sunrise and sunset):

rise_time.setText(response.body().getSys().getSunrise() + " ");
                set_time.setText(response.body().getSys().getSunset() + " ");

What I have tried:

I tried using this code for dt in my example class:

public String getPrettyDate() {
        SimpleDateFormat HMM = new SimpleDateFormat("hh:mm a", Locale.US);
        final Date date = new Date(dt*1000);
        return HMM.format(date);
    }

Then called

time_field.setText("Last Updated:" + " " + response.body().getPrettyDate());

from my Activity class. It converted the time well, but it didn't display the data accurately(i.e when it was 3 pm here, it showed 9 pm).

I also tried using this:

public static String toDate(int time) {
        SimpleDateFormat HMM = new SimpleDateFormat("hh:mm a");
        HMM.setTimeZone(TimeZone.getTimeZone("UTC"));
        final Date date = new Date(time*1000);
        return HMM.format(date);
    }

for my sunrise and sunset.
Then called

rise_time.setText(todate(response.body().getSys().getSunrise() + " "));
                set_time.setText(todate(response.body().getSys().getSunset() + " "));

In my fragment class, but it gave an error suggesting to change int to string.
I as well asked it on StackOverflow java - Convert Datetime, Sunrise and Sunset from miliseconds to real time format - Stack Overflow[^] , but It got termed as duplicate when it's not and removed.