Revert "Feat: Add date type (elastic#271)" (elastic#281)

This reverts commit 070a48ae2148a6d4ded1b66276068e6480cdd346.

common/functions/date.js

@@ -1,44 +1,25 @@
 import moment from 'moment';
 
-const getInputDate = (input) => {
-  // return current date if no input
-  if (!input) return new Date();
-
-  // attempt to cast to a number
-  const numInput = Number(input);
-  if (!isNaN(numInput)) return numInput;
-
-  // return the input
-  return input;
-};
-
 export const date = {
   name: 'date',
-  type: 'date',
+  type: 'number',
   context: {
     types: ['null'],
   },
-  help: 'Returns the current time, or a time parsed from a string, as milliseconds since epoch.',
+  help: 'Returns the current time, or a time parsed from a string, as milliseconds since epoch',
   args: {
     _: {
       types: ['string', 'null'],
-      help: 'An optional date string to parse into milliseconds since epoch. ' +
-        'Can be either a valid Javascript Date input or a string to parse using the format argument. ',
+      help: 'An optional date string to parse into milliseconds since epoch',
     },
     format: {
       types: ['string', 'null'],
-      help: 'The momentJS format for parsing the optional date string (See https://momentjs.com/docs/#/displaying/).',
+      help: 'The momentJS format for parsing the optional date string (See https://momentjs.com/docs/#/displaying/)',
     },
   },
   fn: (context, args) => {
-    const inputDate = getInputDate(args._);
-    const outputDate = (args._ && args.format) ? moment(inputDate, args.format).toDate() : new Date(inputDate);
-
-    if (isNaN(outputDate.getTime())) throw new Error(`Invalid date input: ${args._}`);
-
-    return {
-      type: 'date',
-      value: outputDate,
-    };
+    if (!args._) return moment().valueOf();
+    if (!args.format) return moment(args._).valueOf();
+    return moment(args._, args.format).valueOf();
   },
 };

common/functions/formatdate.js

@@ -14,6 +14,6 @@ export const formatdate = {
     },
   },
   fn: (context, args) => {
-    return moment(new Date(context)).format(args._);
+    return moment(context).format(args._);
   },
 };

common/types/index.js

@@ -1,7 +1,6 @@
 import { boolean } from './boolean';
 import { datatable } from './datatable';
 import { dataurl } from './dataurl';
-import { date } from './date';
 import { error } from './error';
 import { filter } from './filter';
 import { image } from './image';
@@ -17,7 +16,6 @@ export const typeSpecs = [
   boolean,
   datatable,
   dataurl,
-  date,
   error,
   filter,
   image,