UE4 unix13位时间戳 转Windows DateTime

步骤1：   首先创建一个父类为BlueprintFunctionLibrary的C++类

 2.命名为 BPF_UnixTimestampToDateTime ，会自动打开VS2019，生成一个类；

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "Misc/DateTime.h"
#include "CoreMinimal.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "BPF_UnixTimestampToDateTime.generated.h"


UCLASS()
class MYPROJECT_API UBPF_UnixTimestampToDateTime : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()
	//
	UFUNCTION(BlueprintPure, Category = "UnixTimestamp")
		static FDateTime UnixTimestampToDateTime(int64 UnixTime);
	UFUNCTION(BlueprintPure, Category = "UnixTimestamp")
		static FDateTime UnixTimestampToDateTime_s(FString UnixTime);
};

上面这段代码，值得注意的是，每个想要暴露给蓝图的函数或者变量，都必须要声明

比如： UFUNCTION(BlueprintPure, Category = "UnixTimestamp")

// Fill out your copyright notice in the Description page of Project Settings.


#include "BPF_UnixTimestampToDateTime.h"


FDateTime UBPF_UnixTimestampToDateTime::UnixTimestampToDateTime_s(FString UnixTime)
{
	char* result = TCHAR_TO_ANSI(*UnixTime);
	uint64 unixTime_t = _atoi64(result);
	uint64 tmpUnix = unixTime_t / 1000;

	//sprintf(result, "%lld", unixTime_t);
	FDateTime Time = FDateTime::FromUnixTimestamp(tmpUnix);
	FTimespan spanT = FTimespan(8,0,0);
	Time = Time.operator+(spanT);		//UTC time +8 hour(china)/
	

	return Time;
}

因为linux系统传过来的时间戳是13位，然而UE4.26系统能转换的只有10位，所以需要除以1000（去掉毫秒部分），然后FromUnixTimestamp函数 才能得到正确的时间。

3.然后编译...  在蓝图里用；右键输入函数  UnixTimestampToDateTime_s