feat: support timezone offset argument for date filter, #553

src/builtin/filters/date.ts

@@ -4,11 +4,11 @@ import { toValue, stringify, isString, isNumber } from '../../util/underscore'
 import { FilterImpl } from '../../template/filter/filter-impl'
 import { TimezoneDate } from '../../util/timezone-date'
 
-export function date (this: FilterImpl, v: string | Date, arg: string) {
+export function date (this: FilterImpl, v: string | Date, format: string, timeZoneOffset?: number) {
   const opts = this.context.opts
   let date: LiquidDate
   v = toValue(v)
-  arg = stringify(arg)
+  format = stringify(format)
   if (v === 'now' || v === 'today') {
     date = new Date()
   } else if (isNumber(v)) {
@@ -25,10 +25,12 @@ export function date (this: FilterImpl, v: string | Date, arg: string) {
     date = v
   }
   if (!isValidDate(date)) return v
-  if (opts.hasOwnProperty('timezoneOffset')) {
+  if (timeZoneOffset !== undefined) {
+    date = new TimezoneDate(date, timeZoneOffset)
+  } else if (opts.timezoneOffset !== undefined) {
     date = new TimezoneDate(date, opts.timezoneOffset!)
   }
-  return strftime(date, arg)
+  return strftime(date, format)
 }
 
 function isValidDate (date: any): date is Date {

test/integration/builtin/filters/date.ts

@@ -61,6 +61,9 @@ describe('filters/date', function () {
     it('should offset UTC date literal', function () {
       return test('{{ "1990-12-31T23:00:00Z" | date: "%Y-%m-%dT%H:%M:%S"}}', '1990-12-31T17:00:00', undefined, opts)
     })
+    it('should support timezone offset argument', function () {
+      return test('{{ "1990-12-31T23:00:00Z" | date: "%Y-%m-%dT%H:%M:%S", 360}}', '1990-12-31T17:00:00')
+    })
     it('should offset date literal with timezone 00:00 specified', function () {
       return test('{{ "1990-12-31T23:00:00+00:00" | date: "%Y-%m-%dT%H:%M:%S"}}', '1990-12-31T17:00:00', undefined, opts)
     })