fix: editing outside the app and saving to gallery, the timestamp of the photo was in UTC

src/main/kotlin/io/ionic/libs/ioncameralib/helper/IONCAMRExifHelper.kt

@@ -22,6 +22,9 @@ package io.ionic.libs.ioncameralib.helper
 import android.media.ExifInterface
 import android.net.Uri
 import java.io.IOException
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
 
 class IONCAMRExifHelper : IONCAMRExifHelperInterface {
 
@@ -203,4 +206,19 @@ class IONCAMRExifHelper : IONCAMRExifHelperInterface {
         )
     }
 
+    override fun setCurrentDateTime() {
+        // Format datetime as EXIF expects: "yyyy:MM:dd HH:mm:ss"
+        val currentDateTime = SimpleDateFormat(
+            "yyyy:MM:dd HH:mm:ss",
+            Locale.getDefault()
+        ).format(Date())
+
+        outFile?.let {
+            it.setAttribute(ExifInterface.TAG_DATETIME, currentDateTime)
+            it.setAttribute(ExifInterface.TAG_DATETIME_ORIGINAL, currentDateTime)
+            it.setAttribute(ExifInterface.TAG_DATETIME_DIGITIZED, currentDateTime)
+            it.saveAttributes()
+        }
+    }
+
 }

src/main/kotlin/io/ionic/libs/ioncameralib/helper/IONCAMRExifHelperInterface.kt

@@ -13,4 +13,5 @@ interface IONCAMRExifHelperInterface {
     fun getOrientation(): Int
     fun resetOrientation()
     fun getOrientationFromExif(exif: ExifInterface): Int
+    fun setCurrentDateTime()
 }

src/main/kotlin/io/ionic/libs/ioncameralib/manager/IONCAMRCameraManager.kt

@@ -205,6 +205,13 @@ class IONCAMRCameraManager(
             try {
                 exif.createInFile(sourcePath)
                 exif.readExifData()
+
+                // When editing externally, the external app may write EXIF datetime in UTC.
+                // Fix it by writing the current local datetime back to the file.
+                if (camParameters.allowEdit && !intentEditedPath.isNullOrEmpty()) {
+                    exif.createOutFile(sourcePath)
+                    exif.setCurrentDateTime()
+                }
             } catch (e: IOException) {
                 e.printStackTrace()
             }

src/test/kotlin/io/ionic/libs/ioncameralib/mocks/IONExifHelperMock.kt

@@ -43,4 +43,8 @@ class IONExifHelperMock: IONCAMRExifHelperInterface {
     override fun getOrientationFromExif(exif: ExifInterface): Int {
         return testOrientation
     }
+
+    override fun setCurrentDateTime() {
+        // do nothing
+    }
 }