Java Utililty Methods Hour

List of utility methods to do Hour

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Description

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

Method

intgetCurrentHours()
get Current Hours 
return Calendar.getInstance().get(Calendar.HOUR);
intgetCurrHour()
get Curr Hour 
Calendar c = Calendar.getInstance();
c.setTime(new Date());
return c.get(Calendar.HOUR_OF_DAY);
longgetDelay(int hour, int min)
get Delay 
if (hour == -1) {
    return 0;
Calendar calendar = Calendar.getInstance();
calendar.clear();
calendar.setTime(new Date());
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, min);
...
longgetDelayToNextHour(int amount, boolean skipNext)
This method could be named better, Here is what it does If you want to schedule a task every 2 hours, it is easier to track it if it happens at 2 am, 4 am, 6 am, 8 am .... 
if (amount <= 0 || amount > 12) {
    throw new IllegalArgumentException("The amount must be between 1 and 12 and be a divisor of 24");
Calendar c = Calendar.getInstance();
long currentTime = c.getTimeInMillis();
c.clear(Calendar.MINUTE);
c.clear(Calendar.SECOND);
c.clear(Calendar.MILLISECOND);
...
intgetGMTHour(int localHour)
get GMT Hour 
Calendar c = Calendar.getInstance();
c.clear();
c.set(Calendar.HOUR_OF_DAY, localHour);
Date t = c.getTime();
c = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
c.clear();
c.setTime(t);
return c.get(Calendar.HOUR_OF_DAY);
...
StringgetHexString(byte[] raw)
Converts each byte of the given byte array to a HEX value and returns the concatenation of these values 
try {
    byte[] hex = new byte[2 * raw.length];
    int index = 0;
    for (byte b : raw) {
        int v = b & 0xFF;
        hex[index++] = HEX_CHAR_TABLE[v >>> 4];
        hex[index++] = HEX_CHAR_TABLE[v & 0xF];
    return new String(hex, "ASCII"); 
} catch (UnsupportedEncodingException e) {
    String msg = MessageFormat.format("Something went wrong while converting to HEX: {0}", e.getMessage()); 
    throw new RuntimeException(msg, e);
StringgetHour()
get Hour 
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
String hour;
hour = dateString.substring(11, 13);
return hour;
intgetHour()
get Hour 
return CALENDAR.get(11);
intgetHour()
get Hour 
return Calendar.getInstance().get(Calendar.HOUR);
intgetHour()
get Hour 
Calendar cpcalendar = new GregorianCalendar();
cpcalendar.setTime(getDate());
return cpcalendar.get(Calendar.HOUR_OF_DAY);