Execution gets stuck at date picking functionality of selenium webdriver - selenium

Question

I am new to selenium automation, I have written a script to pick check in and check out dates from webpage of tripadvisor.in. I hope the code and xpaths are correct coz out of 7 or 8 executions the scrips successfully running only once. I thought abt synchronization issue and tried adding all types of waits but still the execution getting stuck as calendar. Sometimes stucking at check-in date, sometimes at check-out date but sometimes working fine. Can I get help to sort this issue plz...
public void selectCheckDate(String date, WebElement forwardArrow) {
SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
try {
Date expectedDate = dateFormat.parse(prop.getProperty(date));
String day = new SimpleDateFormat("dd").format(expectedDate);
String month = new SimpleDateFormat("MMMM").format(expectedDate);
String year = new SimpleDateFormat("yyyy").format(expectedDate);
String expectedMonthYear = month + " " + year;
logger.log(Status.INFO, "Expected Month and year: "+expectedMonthYear);
WebDriverWait wait = new WebDriverWait(driver, 20);
String dd1 = "", dd2 = "";
String d1 = null, d2 = null;
boolean flag1 = false;
boolean flag2 = false;
while (true) {
String displayDate1 = driver.findElement(By.xpath("//*[#class='vr-datepicker-LargeStyles__caption--Srrff']/div")).getText();
String displayDate2 = driver.findElement(By.xpath("(//*[#class='vr-datepicker-LargeStyles__caption--Srrff']/div)[2]")).getText();
if (displayDate1.contains(expectedMonthYear)) {
//addWait();
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 7; j++) {
d1 = "//*[#id='BODY_BLOCK_JQUERY_REFLOW']/div[14]/div/div/div[2]/div/div/div[2]/div[1]/div[3]/div["
+ i + "]/div[" + j + "]";
boolean ex = isElementExists(d1);
if(ex==true) {
dd1 = driver.findElement(By.xpath(d1)).getText();
if (dd1.equals(day)) {
wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath(d1))).click();
//driver.findElement(By.xpath(d1)).click();
flag1 = true;
break;
}
}
}
if (flag1 == true) {
break;
}
}
if (flag1 == true) {
reportPass("Entered date: "+prop.getProperty(date));
break;
}
} else if (displayDate2.contains(expectedMonthYear)) {
//addWait();
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 7; j++) {
d2 = "//*[#id='BODY_BLOCK_JQUERY_REFLOW']/div[14]/div/div/div[2]/div/div/div[2]/div[2]/div[3]/div["
+ i + "]/div[" + j + "]";
boolean ex1 = isElementExists(d2);
if(ex1==true) {
dd2 = driver.findElement(By.xpath(d2)).getText();
if (dd2.equals(day)) {
wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath(d2))).click();
//driver.findElement(By.xpath(d2)).click();
flag2 = true;
break;
}
}
}
if (flag2 == true) {
break;
}
}
if (flag2 == true) {
reportPass("Entered date: "+prop.getProperty(date));
break;
}
} else {
forwardArrow.click();
}
}
} catch (ParseException e) {
reportFail(e.getMessage());
}
}