Android Utililty Methods Long to Date Convert

SimpleDateFormat format = new SimpleDateFormat("dd");
StringBuilder dateString = new StringBuilder(
        format.format(dateTimeMillis));
return Integer.parseInt(dateString.toString());

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(timeMillis);
return calendar.get(Calendar.DAY_OF_WEEK);

return getDateTimeString(new Date(date), DateFormat.DEFAULT, locale);

Date date = new Date(milliseconds);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");
return sdf.format(date);

String unit = SECOND;
String residueUnit = null;
long currentTimeInSeconds = System.currentTimeMillis() / 1000;
long elapsedTimeInSeconds = currentTimeInSeconds - seconds;
int count = 0;
int residue = 0;
if (elapsedTimeInSeconds > SECONDS_IN_MIN
        && elapsedTimeInSeconds < SECONDS_IN_HOUR) {
...

Date date = new Date(timestamp);
SimpleDateFormat sdf = new SimpleDateFormat(dateTimeFormat,
        Locale.US);
return sdf.format(date);

if (timestamp < 0)
    return "";
if (sResources == null) {
    sResources = context.getResources();
final long now = System.currentTimeMillis();
final long offset = sTimeZone.getOffset(now);
final long diff = now - offset - timestamp;
...

SimpleDateFormat format = new SimpleDateFormat("HH");
StringBuilder dateString = new StringBuilder(
        format.format(dateTimeMillis));
return Integer.parseInt(dateString.toString());

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(timeMillis);
return calendar.get(Calendar.HOUR_OF_DAY);

String format = String.format("%%0%dd", 2);
long elapsedTime = dateTimeMillis / 1000;
String minutes = String.format(format, (elapsedTime % 3600) / 60);
String hours = String.format(format, elapsedTime / 3600);
return hours + ":" + minutes;