diff --git a/src/config/db.config.ts b/src/config/db.config.ts
index 634f392..4a12cdc 100644
--- a/src/config/db.config.ts
+++ b/src/config/db.config.ts
@@ -40,7 +40,7 @@ const sequelizeConnection = new Sequelize(dbName, dbUser, dbPassword, {
         idle: 10000,
     },
     logging: false,
-    timezone: "+02:00", //for writing to database
+    timezone: "Europe/Vienna", //for writing to database
 });
 // sequelizeConnection.addModels([Dataset, Abstract]);
 // sequelizeConnection.addModels([DocumentXmlCache]);
diff --git a/src/controllers/oai.controller.ts b/src/controllers/oai.controller.ts
index 471c729..be395a2 100644
--- a/src/controllers/oai.controller.ts
+++ b/src/controllers/oai.controller.ts
@@ -17,6 +17,8 @@ import XmlModel from "../library/XmlModel";
 import Configuration from "../library/oai/OaiConfiguration";
 import ResumptionToken from "../library/oai/ResumptionToken";
 import TokenWorker from "../library/oai/TokenWorker";
+import utc from "dayjs/plugin/utc";
+import timezone from "dayjs/plugin/timezone";
 
 interface XslTParameter {
     [key: string]: any;
@@ -53,6 +55,8 @@ export class OaiController {
     constructor() {
         this.proc = readFileSync(__dirname + "/datasetxml2oai.sef.json");
         this.configuration = new Configuration();
+        dayjs.extend(utc);
+        dayjs.extend(timezone);
     }
 
     @Post("")
@@ -81,7 +85,7 @@ export class OaiController {
         let earliestDateFromDb;
         const firstPublishedDataset: Dataset | null = await Dataset.earliestPublicationDate();
         firstPublishedDataset != null &&
-            (earliestDateFromDb = dayjs(firstPublishedDataset.server_date_published).format("YYYY-MM-DDThh:mm:ss[Z]"));
+            (earliestDateFromDb = dayjs(firstPublishedDataset.server_date_published).format("YYYY-MM-DDTHH:mm:ss[Z]"));
         this.xsltParameter["earliestDatestamp"] = earliestDateFromDb;
 
         const oaiRequest: OaiParameter = request.query;
@@ -157,7 +161,7 @@ export class OaiController {
 
         // Set response time
         const now: Dayjs = dayjs();
-        this.xsltParameter["responseDate"] = now.format("YYYY-MM-DDThh:mm:ss[Z]");
+        this.xsltParameter["responseDate"] = now.format("YYYY-MM-DDTHH:mm:ss[Z]");
         this.xsltParameter["unixTimestamp"] = now.unix();
 
         // set OAI base url
@@ -446,15 +450,16 @@ export class OaiController {
                     };
                     includeArray.push(icncludeFilter);
                 }
-            }
+            }            
 
+            // const timeZone = "Europe/Vienna"; // Canonical time zone name
             // &from=2020-09-03&until2020-09-03
             // &from=2020-09-11&until=2021-05-11
             if ("from" in oaiRequest && "until" in oaiRequest) {
                 const from = oaiRequest["from"] as string;
-                let fromDate = dayjs(from);
+                let fromDate = dayjs.tz(from, "Europe/Vienna"); //.tz(timeZone);
                 const until = oaiRequest["until"] as string;
-                let untilDate = dayjs(until);
+                let untilDate = dayjs.tz(until, "Europe/Vienna"); //.tz(timeZone);
                 if (!fromDate.isValid() || !untilDate.isValid()) {
                     throw new OaiModelException(
                         StatusCodes.INTERNAL_SERVER_ERROR,
@@ -473,18 +478,25 @@ export class OaiController {
                 fromDate.hour() == 0 && (fromDate = fromDate.startOf("day"));
                 untilDate.hour() == 0 && (untilDate = untilDate.endOf("day"));
 
+                // format("YYYY-MM-DDTHH:mm:ss[Z]"));
+
                 andArray.push({
                     server_date_published: {
-                        // [Sequelize.Op.between]: [fromDate, untilDate]
+                        // [Sequelize.Op.between]: [fromDate.format("YYYY-MM-DD HH:mm:ss"), untilDate.format("YYYY-MM-DD HH:mm:ss")]
                         [Sequelize.Op.and]: {
                             [Sequelize.Op.gte]: fromDate.format("YYYY-MM-DD HH:mm:ss"),
                             [Sequelize.Op.lte]: untilDate.format("YYYY-MM-DD HH:mm:ss"),
                         },
                     },
                 });
+                // andArray.push({
+                //     server_date_published: {
+                //         [Sequelize.Op.lte]: untilDate.format("YYYY-MM-DD HH:mm:ss"),
+                //     },
+                // });
             } else if ("from" in oaiRequest && !("until" in oaiRequest)) {
                 const from = oaiRequest["from"] as string;
-                let fromDate = dayjs(from);
+                let fromDate = dayjs.tz(from, "Europe/Vienna")
                 if (!fromDate.isValid()) {
                     throw new OaiModelException(
                         StatusCodes.INTERNAL_SERVER_ERROR,
@@ -511,7 +523,7 @@ export class OaiController {
                 }
             } else if (!("from" in oaiRequest) && "until" in oaiRequest) {
                 const until = oaiRequest["until"] as string;
-                let untilDate = dayjs(until);
+                let untilDate = dayjs.tz(until, "Europe/Vienna"); //.tz(timeZone);
                 if (!untilDate.isValid()) {
                     throw new OaiModelException(
                         StatusCodes.INTERNAL_SERVER_ERROR,