Manipulating dates

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I have doubts about the steps to manipulate dates.

The steps below are ok? Can I start studies?

  • I have the attribute Date and I want to insert 2 days.
  • Convert Date in String.
  • Convert String in Calendar.
  • I make the code to manipulate the obtained date.
  • Convert of Calendar for String.
  • Convert of String for Date.
  • Save.

because if I try to declare as Calendar when saved from that mistake?

Unresolved Compilation problem: Type Mismatch: cannot Convert from

Code for more details:

// data em que o dinheiro foi entregue
    @DateTimeFormat(pattern = "dd/MM/yyyy")
    @Temporal(TemporalType.DATE)
    private Date dataEmprestimo;

if I put private Calendar dataEmprestimo, gives the error mentioned above.

java date

  • Can you add the full stacktrace? Because this code is not making much sense with the error.

  • I’m sorry if I can’t express myself well. but I’ll try to explain here.

  • When you try to run, do you pop a stack of errors? If yes, add it to the question, it is easier to locate the source.

  • But why are you changing the type to Calendar? The annotation above indicates that it is Date, not Calendar.

  • I have two doubts. 1º if the step by step to manipulate Date is correct. 2º because if I insert Calendar instead of Date error: Type Mismatch: cannot Convert from Calendar to Date] with root cause java.lang.Error: Unresolved Compilation problem: Type Mismatch: cannot Convert from Calendar to Date

  • if I remove @Temporal(Temporaltype.DATE) from right? by to Calendar?

  • Gives error because they are different types, and your annotation before the field says it is a Date field.

  • I removed the note and it worked, a light started to appear here.... If it is not too much to ask, studying he asked to put the above note, why did he ask it? removing it implies that?

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1 answer

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Using the Java 8 API makes it easier to handle dates

import java.time.LocalDate;
LocalDate dataInicio;
@JsonFormat(pattern = "yyyy-MM-dd")
LocalDate data;

In your object only retrieve the Localdate field and run

 objeto.getData().plusDays(1)

//Adds a day

  • I started the study with Localdate and the date being saved aced00057372000d6a6176612e74696d652e536572955d84ba1b2248b20c00007870770703000007e1060278. 
se eu incluir @jsonFormat da erro Field error in object 'emprestimo' on field 'primeiraEmprestimo': rejected value [09/06/2017]; codes [typeMismatch.emprestimo.primeiraEmprestimo,typeMismatch.primeiraEmprestimo,typeMismatch.java.time.LocalDate,typeMismatch]; arguments [org.springframework.context.support.Defaultme

  • is because you are using the dd/mm/yyyy format, only change the format so that it is equal or change your date so that it has the format I declare

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