diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed424d4273c374fc2fbb991f053ee58c697cb906..dfa42519008a6cd0768daf8f043e6fe1f81240b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 - If the data reports that a parameter has a period of record, yet the observations service returns no data, the application will no longer hang.
+- IV data requests with a positive UTC offset will now be formatted properly.
 
 ## [1.7.0](https://code.usgs.gov/wma/iow/waterdataui/-/compare/waterdataui-1.6.0...waterdataui-1.7.0) - 2022-09-15
 ### Changed
diff --git a/assets/src/scripts/web-services/instantaneous-values.js b/assets/src/scripts/web-services/instantaneous-values.js
index 33730c7a2e1bc33a88dba1730e42a32dcf7fcdcd..0f08b8780768e25e520cb5ccbef950f362f21b81 100644
--- a/assets/src/scripts/web-services/instantaneous-values.js
+++ b/assets/src/scripts/web-services/instantaneous-values.js
@@ -55,7 +55,7 @@ export const getIVServiceURL = function({
         dataEndpoint = dayCount && dayCount < 120 ? config.IV_DATA_ENDPOINT : config.HISTORICAL_IV_DATA_ENDPOINT;
     } else if (startTime && endTime) {
         const startDateTime =  DateTime.fromISO(startTime);
-        timeParams = `startDT=${startTime}&endDT=${endTime}`;
+        timeParams = `startDT=${String(startTime).replace('+', '%2B')}&endDT=${String(endTime).replace('+', '%2B')}`;
         dataEndpoint = ivDataEndpoint(startDateTime);
     } else {
         timeParams = '';
diff --git a/assets/src/scripts/web-services/instantaneous-values.test.js b/assets/src/scripts/web-services/instantaneous-values.test.js
index e42b64b39f7c0a1783a80dfd683fdf7e23c26551..54e3a796a4feeb3087f73eebbd3e22f8b1c27cd4 100644
--- a/assets/src/scripts/web-services/instantaneous-values.test.js
+++ b/assets/src/scripts/web-services/instantaneous-values.test.js
@@ -125,8 +125,8 @@ describe('web-services/instantaneous-values', () => {
             });
             expect(result).toContain(`${config.IV_DATA_ENDPOINT}`);
             expect(result).not.toContain('period');
-            expect(result).toContain(`startDT=${startTime}`);
-            expect(result).toContain(`endDT=${endTime}`);
+            expect(result).toContain(`startDT=${startTime.replace('+', '%2B')}`);
+            expect(result).toContain(`endDT=${endTime.replace('+', '%2B')}`);
         });
 
         it('Expects if no period, but startTime and endTime are defined and more than 120 days in the past, the HISTORICAL_IV_DATA_ENDPOINT is used', () => {
@@ -141,8 +141,8 @@ describe('web-services/instantaneous-values', () => {
             });
             expect(result).toContain(`${config.HISTORICAL_IV_DATA_ENDPOINT}`);
             expect(result).not.toContain('period');
-            expect(result).toContain(`startDT=${startTime}`);
-            expect(result).toContain(`endDT=${endTime}`);
+            expect(result).toContain(`startDT=${startTime.replace('+', '%2B')}`);
+            expect(result).toContain(`endDT=${endTime.replace('+', '%2B')}`);
         });
     });
 
@@ -181,8 +181,18 @@ describe('web-services/instantaneous-values', () => {
             const request = fetchMock.mock.calls[0][0];
 
             expect(request.url).not.toContain('period');
-            expect(request.url).toContain(`startDT=${startTime}`);
-            expect(request.url).toContain(`endDT=${endTime}`);
+            expect(request.url).toContain(`startDT=${startTime.replace('+', '%2B')}`);
+            expect(request.url).toContain(`endDT=${endTime.replace('+', '%2B')}`);
+        });
+
+        it('Get url includes startDT and endDT with a substituted plus', () => {
+            const startTime = '2018-01-02T15:00:00.000+06:00';
+            const endTime = '2018-01-02T16:45:00.000+06:00';
+            fetchTimeSeries({siteno: siteID, parameterCode: parameterCode, period: null, startTime: startTime, endTime: endTime});
+            const request = fetchMock.mock.calls[0][0];
+            expect(request.url).not.toContain('period');
+            expect(request.url).toContain(`startDT=${startTime.replace('+', '%2B').replace('+', '%2B')}`);
+            expect(request.url).toContain(`endDT=${endTime.replace('+', '%2B').replace('+', '%2B')}`);
         });
 
         it('Get url does not include any time parameters if all are null', () => {