Thymeleaf future/past dates - thymeleaf

Question

I have a database with a timesheet table which has an id column and wcdate(week commencing) column. I have 4 scenarios to accomplish on a web page, using Thymeleaf.
I am new to Thymeleaf, I have looked at Thymeleaf regarding dates, but I flummoxed about how to manipulate a date for instance more than week ago, do something. There are four scenarios which work on timesheet table and wcdate column. I didn't use the <pre> </pre> tags because the code didn't show up correctly.
<!--if the id is 0 but the wcdate is in the future, show as available-->
<span th:if="${timesheet.id == 0 AND timesheet.wcdate.after()}"
class="available">AVAILABLE</span>
<!--if the timesheet id is 0 and the wcdate is today or in the past, show as missing-->
<span
th:unless="${timesheet.id == 0 AND timesheet.wcdate.createNow(),'YYYY/MM/dd HH:mm')}"
class="missing">MISSING</span>
<!--if timesheet is 0-->
<span
th:unless="${timesheet.id == 0}"
class="draft">DRAFT</span>
<!--if the id is not 0 but the wcdate is more than a week ago -->
<span
th:unless="${timesheet.id == !0 AND timesheet.wcdate.}"
class="overdue">OVERDUE</span>

Answer 1

There is no need to directly expose an entity to your template, you can expose additional helper variables to make your templates simpler.
I am currently supposing that your controller looks something like this:
#GetMapping
public String showTimesheet(Model model) {
Timesheet timesheet = ... // from service or repo
model.addAttribute("timesheet", timesheet );
}
You can do something like this:
#GetMapping
public String showTimesheet(Model model) {
Timesheet timesheet = ... // from service or repo
model.addAttribute("timesheet", timesheet );
model.addAttribute("timesheetStatus", calculateTimesheetStatus(timesheet) );
}
And your template becomes:
<span th:class="${timesheetStatus}">${timesheetStatus}</span>
This way, you can do the calculations in Java.
If the Timesheet class has all the info, you can also expose a getStatus() method and use something like this for the template:
<span th:class="${timesheet.status}">${timesheet.status}</span>