Java Utililty Methods Calendar Calculate

List of utility methods to do Calendar Calculate

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Description

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

Method

Calendardecode(String timestamp, Calendar calendar)
Converts a DSA encoded timestamp into a Java Calendar. 
if (calendar == null) {
    calendar = Calendar.getInstance();
try {
    char[] chars = timestamp.toCharArray();
    int idx = 0;
    int year = convertDigits(chars[idx++], chars[idx++], chars[idx++], chars[idx++]);
    validateChar(chars[idx++], '-');
...
StringBuilderencode(Calendar calendar, boolean encodeTzOffset, StringBuilder buf)
Converts a Java Calendar into a DSA encoded timestamp. 
if (buf == null) {
    buf = new StringBuilder();
long millis = calendar.getTimeInMillis();
int tmp = calendar.get(Calendar.YEAR);
buf.append(tmp).append('-');
tmp = calendar.get(Calendar.MONTH) + 1;
if (tmp < 10)
...
booleanequals(Calendar calendar1, Calendar calendar2)
Equals two calendar, compare day to day, month to month and year to year 
int day1 = calendar1.get(Calendar.DAY_OF_MONTH);
int day2 = calendar2.get(Calendar.DAY_OF_MONTH);
int month1 = calendar1.get(Calendar.MONTH);
int month2 = calendar2.get(Calendar.MONTH);
int year1 = calendar1.get(Calendar.YEAR);
int year2 = calendar2.get(Calendar.YEAR);
return (day1 == day2 && month1 == month2 && year1 == year2);
StringFormatTime(Calendar p_time, boolean p_showMilliseconds)
Format Time 
return FormatTime(p_time.get(Calendar.HOUR_OF_DAY), p_time.get(Calendar.MINUTE),
        p_time.get(Calendar.SECOND), (p_showMilliseconds ? p_time.get(Calendar.MILLISECOND) : -1), ":");
CalendargetCalendar(long millis)
get Calendar 
Calendar c = Calendar.getInstance();
c.setTimeInMillis(millis);
return c;
GregorianCalendargetGregorianCalendar(String yyyymmdd)
get Gregorian Calendar 
int yyyy = Integer.parseInt(yyyymmdd.substring(0, 4));
int mm = Integer.parseInt(yyyymmdd.substring(4, 6));
int dd = Integer.parseInt(yyyymmdd.substring(6, 8));
GregorianCalendar calendar = new GregorianCalendar(yyyy, mm - 1, dd, 0, 0, 0);
return calendar;
longgetLongTime(Calendar cal)
get Long Time 
int date = getDateInt(cal);
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
String hourStr = addPreZero(hour);
String minuteStr = addPreZero(minute);
String time = date + hourStr + minuteStr;
return Long.parseLong(time);
StringgetTimeStr3(Calendar timeInstance)
Returns a string of the time instance in string format for internal use. 
Calendar time = timeInstance;
int field;
String year = "", month = "", day = "", hour = "", minute = "", second = "";
String timeStr = "";
field = time.get(Calendar.YEAR);
if (field < 10) {
    year = "000";
year = year + Integer.toString(field);
field = time.get(Calendar.MONTH) + 1;
if (field < 10) {
    month = "0";
month = month + Integer.toString(field);
field = time.get(Calendar.DAY_OF_MONTH);
if (field < 10) {
    day = "0";
day = day + Integer.toString(field);
field = time.get(Calendar.HOUR_OF_DAY);
if (field < 10) {
    hour = "0";
hour = hour + Integer.toString(field);
field = time.get(Calendar.MINUTE);
if (field < 10) {
    minute = "0";
minute = minute + Integer.toString(field);
field = time.get(Calendar.SECOND);
if (field < 10) {
    second = "0";
second = second + Integer.toString(field);
timeStr = year + month + day + hour + minute + second;
return timeStr;
StringgetTimeString(Calendar cal)
get Time String 
int hour = cal.get(Calendar.HOUR);
int minute = cal.get(Calendar.MINUTE);
boolean isAm = (cal.get(Calendar.AM_PM) == Calendar.AM);
String hourStr;
String minuteStr;
if (!isAm) {
    hour += 12;
if (hour < 10) {
    hourStr = "0" + Integer.toString(hour);
} else {
    hourStr = Integer.toString(hour);
if (minute < 10) {
    minuteStr = "0" + Integer.toString(minute);
} else {
    minuteStr = Integer.toString(minute);
String timeStr = hourStr + ":" + minuteStr;
return timeStr;
StringgetTimeStrWithMillisecond(Calendar timeInstance)
get Time Str With Millisecond 
Calendar time = timeInstance;
int field;
String year = "", month = "", day = "", hour = "", minute = "", second = "", millisecond = "";
String timeStr = "";
year = Integer.toString(time.get(Calendar.YEAR));
field = time.get(Calendar.MONTH) + 1;
if (field < 10) {
    month = "0";
...