Java Utililty Methods Hour Calculate

List of utility methods to do Hour Calculate

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Description

The list of methods to do Hour Calculate are organized into topic(s).

Method

doublegetDoubleValue(String hours)
get Double Value 
double doubleValue = 0.0;
try {
    doubleValue = getStandardHoursNumberFormat().parse(hours).doubleValue();
} catch (ParseException e) {
    doubleValue = Double.valueOf(hours);
return doubleValue;
StringgetExpiresDate(int hours)
get Expires Date 
GregorianCalendar calendar = new GregorianCalendar();
calendar.add(Calendar.HOUR, hours);
Date date = calendar.getTime();
return dateToRFC1123(date);
longgetTime(String dateStr, int hour, String timeZone)
get Time 
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
    simpleDateFormat.setTimeZone(TimeZone.getTimeZone(timeZone));
    Date date = simpleDateFormat.parse(dateStr + " " + hour + ":00:00");
    return date.getTime();
} catch (ParseException ex) {
    System.out.println("Exception " + ex);
return 0L;
longgetTimestampFromDateHour2(String d)
get Timestamp From Date Hour 
try {
    return HOUR_NAME_FORMAT2.parse(d).getTime();
} catch (ParseException e) {
    e.printStackTrace();
return 0;
StringgetTimeStringOfHourBefore(int hour)
get Time String Of Hour Before 
final Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.add(Calendar.HOUR, hour * -1);
return getTimestampFormat().format(calendar.getTime());
DategetTomorrowSixHours()
get Tomorrow Six Hours 
Calendar c = Calendar.getInstance();
c.add(Calendar.DAY_OF_YEAR, 1);
c.add(Calendar.HOUR_OF_DAY, 6);
Date date = c.getTime();
String t = dayFormater.format(date);
try {
    date = dayFormater.parse(t);
} catch (ParseException e) {
...
DategetWeeHours()
get Wee Hours 
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
return calendar.getTime();
StringhoursMinsSecsFromMs(long ms)
hours Mins Secs From Ms 
NumberFormat nf = NumberFormat.getIntegerInstance();
nf.setMinimumIntegerDigits(2);
long hours = ms / MS_IN_HOUR;
long hourRem = ms - (hours * MS_IN_HOUR);
long mins = hourRem / MS_IN_MIN;
long minsRem = hourRem - (mins * MS_IN_MIN);
long secs = minsRem / MS_IN_SEC;
return hours + ":" + nf.format(mins) + ":" + nf.format(secs);
...
booleanisHourMinute(String str)
is Hour Minute 
SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");
dateFormat.setLenient(false);
try {
    dateFormat.parse(str);
    return true;
} catch (Exception e) {
    return false;
booleanisValidTime(int hour, int minute, boolean ampm)
is Valid Time 
if (minute < 0 || minute > 59)
    return false;
if (ampm && (hour < 1 || hour > 12))
    return false;
else if (hour < 0 || hour > 23)
    return false;
else
    return true;
...