diff --git a/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/DateTimeUtils.java b/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/DateTimeUtils.java
new file mode 100644
index 0000000..a52ffa0
--- /dev/null
+++ b/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/DateTimeUtils.java
@@ -0,0 +1,22 @@
+package com.utopiaindustries.hseobservationsapp.helper;
+
+import android.os.Build;
+
+import androidx.annotation.RequiresApi;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class DateTimeUtils {
+
+	public static final String HTML5_DATETIME_INPUT_FORMAT_WITH_SECONDS = "yyyy-MM-dd'T'HH:mm:ss";
+
+	/**
+	 * format localdatetime into a given format string
+	 */
+	@RequiresApi(api = Build.VERSION_CODES.O)
+    public static String getFormattedDateTimeString(LocalDateTime dateTime, String dateTimeFormat ) {
+		DateTimeFormatter formatter = DateTimeFormatter.ofPattern( dateTimeFormat );
+		return dateTime.format( formatter );
+	}
+}
diff --git a/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/ReleaseAsset.java b/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/ReleaseAsset.java
index e13ae13..d80744e 100644
--- a/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/ReleaseAsset.java
+++ b/app/src/main/java/com/utopiaindustries/hseobservationsapp/helper/ReleaseAsset.java
@@ -1,5 +1,11 @@
 package com.utopiaindustries.hseobservationsapp.helper;
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+import com.utopiaindustries.hseobservationsapp.utils.jackson.ZonedDateTimeDeserializer;
+
 import java.time.ZonedDateTime;
 
 
diff --git a/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/LocalDateTimeDeserializer.java b/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/LocalDateTimeDeserializer.java
new file mode 100644
index 0000000..be184df
--- /dev/null
+++ b/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/LocalDateTimeDeserializer.java
@@ -0,0 +1,35 @@
+package com.utopiaindustries.hseobservationsapp.utils.jackson;
+
+import android.os.Build;
+
+import androidx.annotation.RequiresApi;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import com.utopiaindustries.hseobservationsapp.helper.DateTimeUtils;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class LocalDateTimeDeserializer extends StdDeserializer<LocalDateTime> {
+
+	private static final long serialVersionUID = 1L;
+
+	@RequiresApi(api = Build.VERSION_CODES.O)
+    public LocalDateTimeDeserializer() {
+		super( LocalDateTime.class );
+	}
+
+	@RequiresApi(api = Build.VERSION_CODES.O)
+    @Override
+	public LocalDateTime deserialize( JsonParser parser, DeserializationContext ctxt ) throws IOException, JsonProcessingException {
+		JsonNode node = parser.getCodec().readTree( parser );
+		String dateStr = node.asText();
+		DateTimeFormatter formatter = DateTimeFormatter.ofPattern( DateTimeUtils.HTML5_DATETIME_INPUT_FORMAT_WITH_SECONDS );
+		return LocalDateTime.parse( dateStr, formatter );
+	}
+}
diff --git a/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/LocalDateTimeSerializer.java b/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/LocalDateTimeSerializer.java
new file mode 100644
index 0000000..4d3e12e
--- /dev/null
+++ b/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/LocalDateTimeSerializer.java
@@ -0,0 +1,25 @@
+package com.utopiaindustries.hseobservationsapp.utils.jackson;
+
+
+import android.os.Build;
+
+import androidx.annotation.RequiresApi;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.utopiaindustries.hseobservationsapp.helper.DateTimeUtils;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+@RequiresApi(api = Build.VERSION_CODES.O)
+public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
+	private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern( DateTimeUtils.HTML5_DATETIME_INPUT_FORMAT_WITH_SECONDS );
+
+	@Override
+	public void serialize( LocalDateTime value, JsonGenerator gen, SerializerProvider serializers ) throws IOException {
+		gen.writeString( value.format( FORMATTER ) );
+	}
+}
diff --git a/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/ZonedDateTimeDeserializer.java b/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/ZonedDateTimeDeserializer.java
new file mode 100644
index 0000000..eebb755
--- /dev/null
+++ b/app/src/main/java/com/utopiaindustries/hseobservationsapp/utils/jackson/ZonedDateTimeDeserializer.java
@@ -0,0 +1,35 @@
+package com.utopiaindustries.hseobservationsapp.utils.jackson;
+
+import android.os.Build;
+
+import androidx.annotation.RequiresApi;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class ZonedDateTimeDeserializer extends StdDeserializer<ZonedDateTime> {
+
+	private static final long serialVersionUID = 1L;
+
+	@RequiresApi(api = Build.VERSION_CODES.O)
+    public ZonedDateTimeDeserializer() {
+		super( LocalDateTime.class );
+	}
+
+	@RequiresApi(api = Build.VERSION_CODES.O)
+    @Override
+	public ZonedDateTime deserialize( JsonParser parser, DeserializationContext ctxt ) throws IOException, JsonProcessingException {
+		JsonNode node = parser.getCodec().readTree( parser );
+		String dateStr = node.asText();
+		DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
+		return ZonedDateTime.parse( dateStr, formatter );
+	}
+}