Convert Local time to UTC and vice versa

Try this:
//convert to UTC to Local format

 public Date getUTCToLocalDate(String date) {
            Date inputDate = new Date();
            if (date != null && !date.isEmpty()) {
                @SuppressLint("SimpleDateFormat") SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
                simpleDateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
                try {
                    inputDate = simpleDateFormat.parse(date);
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }
            return inputDate;
        }  

//convert Local Date to UTC

public String getLocalToUTCDate(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.setTimeZone(TimeZone.getTimeZone("UTC"));
    Date time = calendar.getTime();
    @SuppressLint("SimpleDateFormat") SimpleDateFormat outputFmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    outputFmt.setTimeZone(TimeZone.getTimeZone("UTC"));
    return outputFmt.format(time);
}

I converted local time to GMT/UTC and vice versa using these two methods and this works fine without any problem for me.

public static Date localToGMT() {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
    Date gmt = new Date(sdf.format(date));
    return gmt;
}

pass the GMT/UTC date which you want to convert into device local time to this method:

public static Date gmttoLocalDate(Date date) {

    String timeZone = Calendar.getInstance().getTimeZone().getID();
    Date local = new Date(date.getTime() + TimeZone.getTimeZone(timeZone).getOffset(date.getTime()));
    return local
}

A simplified and condensed version of the accepted answer:

public static Date dateFromUTC(Date date){
    return new Date(date.getTime() + Calendar.getInstance().getTimeZone().getOffset(new Date().getTime()));
}

public static Date dateToUTC(Date date){
    return new Date(date.getTime() - Calendar.getInstance().getTimeZone().getOffset(date.getTime()));
}