Java Utililty Methods Day of

List of utility methods to do Day of

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Description

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

Method

booleanisDiffIsBiggerThanMin(Date lastLogIn, Date now, Long daysL)
is Diff Is Bigger Than Min 
long diffinDays = diffInDays(lastLogIn, now);
Boolean resultValue = diffinDays > daysL;
return resultValue;
booleanisEndOfDay(GregorianCalendar cal1)
is End Of Day 
return guiTimeFormat(cal1).equals(END_OF_DAY);
booleanisHoliday(Date date, String[] excludes, String[] includes)
is Holiday 
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MMdd");
if (date == null) {
    date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int week = calendar.get(Calendar.DAY_OF_WEEK);
String today = simpleDateFormat.format(calendar.getTime());
...
booleanisIn(int reserveDayCount, String dateString)
is In 
Date date = date(dateString);
int interval = interval(date, new Date());
if (interval < 0) {
    return reserveDayCount > Math.abs(interval);
return false;
booleanisInAllDayFormat(String date)
Check if the date is into format yyyyMMdd or yyyy-MM-dd. 
String pattern = getDateFormat(date);
if (pattern == null) {
    return false;
if (pattern.equals(PATTERN_YYYYMMDD) || pattern.equals(PATTERN_YYYY_MM_DD)) {
    return true;
return false;
...
booleanisNowDay(String d)
is Now Day 
boolean flg = false;
SimpleDateFormat sd = new SimpleDateFormat(DATE_FORMAT);
String nowDate = sd.format(new Date());
try {
    d = sd.format(sd.parse(d));
    if (d.equals(nowDate)) {
        flg = true;
} catch (ParseException e) {
    e.printStackTrace();
return flg;
BooleanisSomeDay(String date)
is Some Day 
String today = date2Str(new Date(), "yyyy-MM-dd");
return date.equals(today);
ListlastDays(int count)
last Days 
List<String> strings = new ArrayList<String>();
Calendar day = Calendar.getInstance();
for (int i = 0; i < count; i++) {
    day.add(Calendar.DATE, -1);
    strings.add(df.format(day.getTime()));
return strings;
Stringlong2StringPerDay(long t, SimpleDateFormat sdf)
long String Per Day 
return sdf.format(new Date(t));
longminDayToLong(String time)
min Day To Long 
return new SimpleDateFormat("yyyy-MM-ddZ").parse(time).getTime();