fix: consider user selected timezone while exporting the reports

problem:
Time in CSV exported reports are always in UTC timezone irrespective of user
selected timezone in the UI. There are use case when time in the exported
reports should be other timezone than UTC.

fix:
plywood passes the user selected timezone to format function here
https://github.com/implydata/plywood/blob/master/src/datatypes/dataset.ts#L343
We can use that to get time in the user selected timezone. The time in reports
will also have information about timezone because of ISO format.

src/client/utils/tabular-options/tabular-options.ts

@@ -13,11 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+import { Timezone } from "chronoshift";
 import { List } from "immutable";
 import { AttributeInfo, TabulatorOptions, TimeRange } from "plywood";
 import { Essence } from "../../../common/models/essence/essence";
 import { ConcreteSeries, SeriesDerivation } from "../../../common/models/series/concrete-series";
+import { formatISODateTime } from "../../../common/utils/time/time";
 
 interface SeriesWithDerivation {
   series: ConcreteSeries;
@@ -37,7 +38,7 @@ function findSeriesAndDerivation(name: string, concreteSeriesList: List<Concrete
 export default function tabularOptions(essence: Essence): TabulatorOptions {
   return {
     formatter: {
-      TIME_RANGE: (range: TimeRange) => range.start.toISOString()
+      TIME_RANGE: (range: TimeRange, timezone: Timezone) => formatISODateTime(range.start, timezone)
     },
     attributeFilter: ({ name }: AttributeInfo) => {
       return findSeriesAndDerivation(name, essence.getConcreteSeries()) !== null

src/common/utils/time/time.ts

@@ -22,6 +22,7 @@ import { Unary } from "../functional/functional";
 
 const ISO_FORMAT_DATE = "YYYY-MM-DD";
 const ISO_FORMAT_TIME = "HH:mm";
+const ISO_FORMAT = "YYYY-MM-DDTHH:mm:ss.sssZ"
 const FORMAT_FULL_MONTH_WITH_YEAR = "MMMM YYYY";
 
 export function getMoment(date: Date, timezone: Timezone): Moment {
@@ -166,6 +167,10 @@ export function formatDateTime(date: Date, timezone: Timezone): string {
   return getMoment(date, timezone).format(FULL_FORMAT);
 }
 
+export function formatISODateTime(date: Date, timezone: Timezone): string {
+  return getMoment(date, timezone).format(ISO_FORMAT);
+}
+
 export function formatISODate(date: Date, timezone: Timezone): string {
   return getMoment(date, timezone).format(ISO_FORMAT_DATE);
 }