feat: add preserveTimezones option

src/builtin/filters/date.ts

@@ -1,14 +1,21 @@
 import strftime, { TimezoneDate } from '../../util/strftime'
 import { isString, isNumber } from '../../util/underscore'
+import { FilterImpl } from '../../template/filter/filter-impl'
 
-export function date (v: string | Date, arg: string) {
+export function date (this: FilterImpl, v: string | Date, arg: string) {
   let date = v
   if (v === 'now' || v === 'today') {
     date = new Date()
   } else if (isNumber(v)) {
     date = new Date(v * 1000)
   } else if (isString(v)) {
-    date = /^\d+$/.test(v) ? new Date(+v * 1000) : new TimezoneDate(v)
+    if (/^\d+$/.test(v)) {
+      date = new Date(+v * 1000)
+    } else if (this.context.opts.preserveTimezones) {
+      date = new TimezoneDate(v)
+    } else {
+      date = new Date(v)
+    }
   }
   return isValidDate(date) ? strftime(date, arg) : v
 }

src/liquid-options.ts

@@ -37,6 +37,8 @@ export interface LiquidOptions {
   outputDelimiterLeft?: string;
   /** The right delimiter for liquid outputs. **/
   outputDelimiterRight?: string;
+  /** Whether input strings to date filter preserve the given timezone **/
+  preserveTimezones?: boolean;
   /** Whether `trim*Left`/`trim*Right` is greedy. When set to `true`, all consecutive blank characters including `\n` will be trimed regardless of line breaks. Defaults to `true`. */
   greedy?: boolean;
   /** `fs` is used to override the default file-system module with a custom implementation. */
@@ -69,6 +71,7 @@ export interface NormalizedFullOptions extends NormalizedOptions {
   tagDelimiterRight: string;
   outputDelimiterLeft: string;
   outputDelimiterRight: string;
+  preserveTimezones: boolean;
   greedy: boolean;
   globals: object;
   keepOutputType: boolean;
@@ -89,6 +92,7 @@ export const defaultOptions: NormalizedFullOptions = {
   tagDelimiterRight: '%}',
   outputDelimiterLeft: '{{',
   outputDelimiterRight: '}}',
+  preserveTimezones: false,
   strictFilters: false,
   strictVariables: false,
   lenientIf: false,