From 31246a11a0528dcf78f54162f0d1fd181f7cde0c Mon Sep 17 00:00:00 2001
From: Denis Bykhov <bykhov.denis@gmail.com>
Date: Tue, 24 Mar 2026 00:49:55 +0500
Subject: [PATCH]  Add date difference calculation functionality (#10673)

* Add date difference calculation functionality

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>

* Fix

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>

* Fix formatting

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>

---------

Signed-off-by: Denis Bykhov <bykhov.denis@gmail.com>
---
 models/process/src/functions.ts               |  14 +++
 models/server-process/src/index.ts            |   4 +
 plugins/process-assets/lang/cs.json           |   3 +-
 plugins/process-assets/lang/de.json           |   3 +-
 plugins/process-assets/lang/en.json           |   3 +-
 plugins/process-assets/lang/es.json           |   3 +-
 plugins/process-assets/lang/fr.json           |   3 +-
 plugins/process-assets/lang/it.json           |   3 +-
 plugins/process-assets/lang/ja.json           |   3 +-
 plugins/process-assets/lang/pt-br.json        |   3 +-
 plugins/process-assets/lang/pt.json           |   3 +-
 plugins/process-assets/lang/ru.json           |   7 +-
 plugins/process-assets/lang/tr.json           |   3 +-
 plugins/process-assets/lang/zh.json           |   3 +-
 .../ContextSelectorPopup.svelte               |  88 ++++++++++----
 .../DateDifferenceEditor.svelte               | 107 ++++++++++++++++++
 plugins/process-resources/src/plugin.ts       |   6 +-
 plugins/process-resources/src/utils.ts        |   2 +-
 plugins/process/src/index.ts                  |   1 +
 .../src/components/list/ListCategories.svelte |   2 +-
 server-plugins/process-resources/src/index.ts |   6 +-
 .../process-resources/src/transform.ts        |  29 ++++-
 server-plugins/process/src/index.ts           |   3 +-
 23 files changed, 258 insertions(+), 44 deletions(-)
 create mode 100644 plugins/process-resources/src/components/transformEditors/DateDifferenceEditor.svelte

diff --git a/models/process/src/functions.ts b/models/process/src/functions.ts
index a3c6def254..62f49afee9 100644
--- a/models/process/src/functions.ts
+++ b/models/process/src/functions.ts
@@ -610,6 +610,20 @@ export function defineFunctions (builder: Builder): void {
     process.function.DateFromNumber
   )
 
+  builder.createDoc(
+    process.class.ProcessFunction,
+    core.space.Model,
+    {
+      of: core.class.TypeDate,
+      to: core.class.TypeNumber,
+      category: 'attribute',
+      label: process.string.DateDifference,
+      type: 'convert',
+      editor: process.transformEditor.DateDifferenceEditor
+    },
+    process.function.DateDifference
+  )
+
   builder.createDoc(
     process.class.ProcessFunction,
     core.space.Model,
diff --git a/models/server-process/src/index.ts b/models/server-process/src/index.ts
index 56daf790e1..ad39002e89 100644
--- a/models/server-process/src/index.ts
+++ b/models/server-process/src/index.ts
@@ -211,6 +211,10 @@ export function createModel (builder: Builder): void {
     func: serverProcess.transform.DayFromDate
   })
 
+  builder.mixin(process.function.DateDifference, process.class.ProcessFunction, serverProcess.mixin.FuncImpl, {
+    func: serverProcess.transform.DateDifference
+  })
+
   builder.mixin(process.function.Random, process.class.ProcessFunction, serverProcess.mixin.FuncImpl, {
     func: serverProcess.transform.Random
   })
diff --git a/plugins/process-assets/lang/cs.json b/plugins/process-assets/lang/cs.json
index d1c1c89853..8f39f477f5 100644
--- a/plugins/process-assets/lang/cs.json
+++ b/plugins/process-assets/lang/cs.json
@@ -162,7 +162,8 @@
     "DateFromText": "Datum ze stringu",
     "YearFromDate": "Rok z data",
     "MonthFromDate": "Měsíc z data",
-    "DayFromDate": "Den z data"
+    "DayFromDate": "Den z data",
+    "DateDifference": "Rozdíl dat"
   },
   "error": {
     "MethodNotFound": "Metoda nenalezena: {methodId}",
diff --git a/plugins/process-assets/lang/de.json b/plugins/process-assets/lang/de.json
index 44c1c6809f..7fef53bfdb 100644
--- a/plugins/process-assets/lang/de.json
+++ b/plugins/process-assets/lang/de.json
@@ -162,7 +162,8 @@
     "DateFromText": "Datum aus Text",
     "YearFromDate": "Jahr aus Datum",
     "MonthFromDate": "Monat aus Datum",
-    "DayFromDate": "Tag aus Datum"
+    "DayFromDate": "Tag aus Datum",
+    "DateDifference": "Datumsdifferenz"
   },
   "error": {
     "MethodNotFound": "Methode nicht gefunden: {methodId}",
diff --git a/plugins/process-assets/lang/en.json b/plugins/process-assets/lang/en.json
index a310314daf..63961b48f2 100644
--- a/plugins/process-assets/lang/en.json
+++ b/plugins/process-assets/lang/en.json
@@ -167,7 +167,8 @@
     "DateFromText": "Date from text",
     "YearFromDate": "Year from date",
     "MonthFromDate": "Month from date",
-    "DayFromDate": "Day from date"
+    "DayFromDate": "Day from date",
+    "DateDifference": "Date difference"
   },
   "error": {
     "MethodNotFound": "Method not found: {methodId}",
diff --git a/plugins/process-assets/lang/es.json b/plugins/process-assets/lang/es.json
index f85aa11589..5c0b3b47bc 100644
--- a/plugins/process-assets/lang/es.json
+++ b/plugins/process-assets/lang/es.json
@@ -167,7 +167,8 @@
     "DateFromText": "Fecha desde texto",
     "YearFromDate": "Año desde fecha",
     "MonthFromDate": "Mes desde fecha",
-    "DayFromDate": "Día desde fecha"
+    "DayFromDate": "Día desde fecha",
+    "DateDifference": "Diferencia de fechas"
   },
   "error": {
     "MethodNotFound": "Método no encontrado: {methodId}",
diff --git a/plugins/process-assets/lang/fr.json b/plugins/process-assets/lang/fr.json
index ab333ee6be..de441fc6cc 100644
--- a/plugins/process-assets/lang/fr.json
+++ b/plugins/process-assets/lang/fr.json
@@ -167,7 +167,8 @@
     "DateFromText": "Date depuis texte",
     "YearFromDate": "Année depuis date",
     "MonthFromDate": "Mois depuis date",
-    "DayFromDate": "Jour depuis date"
+    "DayFromDate": "Jour depuis date",
+    "DateDifference": "Différence de dates"
   },
   "error": {
     "MethodNotFound": "Méthode introuvable : {methodId}",
diff --git a/plugins/process-assets/lang/it.json b/plugins/process-assets/lang/it.json
index 1618790ed0..edfa5e14ca 100644
--- a/plugins/process-assets/lang/it.json
+++ b/plugins/process-assets/lang/it.json
@@ -167,7 +167,8 @@
     "DateFromText": "Data da testo",
     "YearFromDate": "Anno da data",
     "MonthFromDate": "Mese da data",
-    "DayFromDate": "Giorno da data"
+    "DayFromDate": "Giorno da data",
+    "DateDifference": "Differenza di date"
   },
   "error": {
     "MethodNotFound": "Metodo non trovato: {methodId}",
diff --git a/plugins/process-assets/lang/ja.json b/plugins/process-assets/lang/ja.json
index fcf7c29ac6..34fa8c7487 100644
--- a/plugins/process-assets/lang/ja.json
+++ b/plugins/process-assets/lang/ja.json
@@ -166,7 +166,8 @@
     "DateFromText": "テキストから日付",
     "YearFromDate": "日付から年",
     "MonthFromDate": "日付から月",
-    "DayFromDate": "日付から日"
+    "DayFromDate": "日付から日",
+    "DateDifference": "日付の差"
   },
   "error": {
     "MethodNotFound": "メソッドが見つかりません: {methodId}",
diff --git a/plugins/process-assets/lang/pt-br.json b/plugins/process-assets/lang/pt-br.json
index 9439b5c930..c3d676f3dd 100644
--- a/plugins/process-assets/lang/pt-br.json
+++ b/plugins/process-assets/lang/pt-br.json
@@ -155,7 +155,8 @@
     "DateFromText": "Data de texto",
     "YearFromDate": "Ano de data",
     "MonthFromDate": "Mês de data",
-    "DayFromDate": "Dia de data"
+    "DayFromDate": "Dia de data",
+    "DateDifference": "Diferença de datas"
   },
   "error": {
     "MethodNotFound": "Método não encontrado: {methodId}",
diff --git a/plugins/process-assets/lang/pt.json b/plugins/process-assets/lang/pt.json
index d0e6af3cad..e6abcac702 100644
--- a/plugins/process-assets/lang/pt.json
+++ b/plugins/process-assets/lang/pt.json
@@ -167,7 +167,8 @@
     "DateFromText": "Data de texto",
     "YearFromDate": "Ano de data",
     "MonthFromDate": "Mês de data",
-    "DayFromDate": "Dia de data"
+    "DayFromDate": "Dia de data",
+    "DateDifference": "Diferença de datas"
   },
   "error": {
     "MethodNotFound": "Método não encontrado: {methodId}",
diff --git a/plugins/process-assets/lang/ru.json b/plugins/process-assets/lang/ru.json
index c6c1a4390e..a3432c1c6e 100644
--- a/plugins/process-assets/lang/ru.json
+++ b/plugins/process-assets/lang/ru.json
@@ -163,11 +163,12 @@
     "TextFromCheckbox": "Строка из чекбокса",
     "NumberFromDate": "Число из даты",
     "DateFromNumber": "Дата из числа",
-    "NumberFromString": "Число из строки",
-    "DateFromString": "Дата из строки",
+    "NumberFromText": "Число из текста",
+    "DateFromText": "Дата из текста",
     "YearFromDate": "Год из даты",
     "MonthFromDate": "Месяц из даты",
-    "DayFromDate": "День из даты"
+    "DayFromDate": "День из даты",
+    "DateDifference": "Разница дат"
   },
   "error": {
     "MethodNotFound": "Метод не найден: {methodId}",
diff --git a/plugins/process-assets/lang/tr.json b/plugins/process-assets/lang/tr.json
index a9154070c7..5cae8eb743 100644
--- a/plugins/process-assets/lang/tr.json
+++ b/plugins/process-assets/lang/tr.json
@@ -162,7 +162,8 @@
     "DateFromText": "Metinden tarih",
     "YearFromDate": "Tarihten yıl",
     "MonthFromDate": "Tarihten ay",
-    "DayFromDate": "Tarihten gün"
+    "DayFromDate": "Tarihten gün",
+    "DateDifference": "Tarih farkı"
   },
   "error": {
     "MethodNotFound": "Metod bulunamadı: {methodId}",
diff --git a/plugins/process-assets/lang/zh.json b/plugins/process-assets/lang/zh.json
index e911b8a14b..cff0efcaa5 100644
--- a/plugins/process-assets/lang/zh.json
+++ b/plugins/process-assets/lang/zh.json
@@ -167,7 +167,8 @@
     "DateFromText": "文本到日期",
     "YearFromDate": "日期到年份",
     "MonthFromDate": "日期到月份",
-    "DayFromDate": "日期到天"
+    "DayFromDate": "日期到天",
+    "DateDifference": "日期差异"
   },
   "error": {
     "MethodNotFound": "找不到方法：{methodId}",
diff --git a/plugins/process-resources/src/components/attributeEditors/ContextSelectorPopup.svelte b/plugins/process-resources/src/components/attributeEditors/ContextSelectorPopup.svelte
index a1d920cf1e..59a81d1075 100644
--- a/plugins/process-resources/src/components/attributeEditors/ContextSelectorPopup.svelte
+++ b/plugins/process-resources/src/components/attributeEditors/ContextSelectorPopup.svelte
@@ -165,8 +165,12 @@
     <!-- svelte-ignore a11y-mouse-events-have-key-events -->
     <button
       bind:this={elements[0]}
-      on:keydown={(event) => keyDown(event, 0)}
-      on:mouseover={() => elements[0]?.focus()}
+      on:keydown={(event) => {
+        keyDown(event, 0)
+      }}
+      on:mouseover={() => {
+        elements[0]?.focus()
+      }}
       on:click={() => {
         onUserRequest()
       }}
@@ -183,8 +187,12 @@
         {#if func.editor !== undefined}
           <Submenu
             bind:element={elements[functionsOffset + i]}
-            on:keydown={(event) => keyDown(event, functionsOffset + i)}
-            on:mouseover={() => elements[functionsOffset + i]?.focus()}
+            on:keydown={(event) => {
+              keyDown(event, functionsOffset + i)
+            }}
+            on:mouseover={() => {
+              elements[functionsOffset + i]?.focus()
+            }}
             label={func.label}
             props={{
               masterTag,
@@ -199,8 +207,12 @@
           <!-- svelte-ignore a11y-mouse-events-have-key-events -->
           <button
             bind:this={elements[functionsOffset + i]}
-            on:keydown={(event) => keyDown(event, functionsOffset + i)}
-            on:mouseover={() => elements[functionsOffset + i]?.focus()}
+            on:keydown={(event) => {
+              keyDown(event, functionsOffset + i)
+            }}
+            on:mouseover={() => {
+              elements[functionsOffset + i]?.focus()
+            }}
             on:click={() => {
               onFunc(func._id)
             }}
@@ -219,8 +231,12 @@
         {#if pc.attributes.length > 0}
           <Submenu
             bind:element={elements[processContextOffset + i]}
-            on:keydown={(event) => keyDown(event, processContextOffset + i)}
-            on:mouseover={() => elements[processContextOffset + i]?.focus()}
+            on:keydown={(event) => {
+              keyDown(event, processContextOffset + i)
+            }}
+            on:mouseover={() => {
+              elements[processContextOffset + i]?.focus()
+            }}
             component={ExecutionContextPresenter}
             props={{
               context: pc,
@@ -236,8 +252,12 @@
           <!-- svelte-ignore a11y-mouse-events-have-key-events -->
           <button
             bind:this={elements[processContextOffset + i]}
-            on:keydown={(event) => keyDown(event, processContextOffset + i)}
-            on:mouseover={() => elements[processContextOffset + i]?.focus()}
+            on:keydown={(event) => {
+              keyDown(event, processContextOffset + i)
+            }}
+            on:mouseover={() => {
+              elements[processContextOffset + i]?.focus()
+            }}
             on:click={() => {
               onProcessContext(pc)
             }}
@@ -254,8 +274,12 @@
         <!-- svelte-ignore a11y-mouse-events-have-key-events -->
         <button
           bind:this={elements[attributesOffset + i]}
-          on:keydown={(event) => keyDown(event, attributesOffset + i)}
-          on:mouseover={() => elements[attributesOffset + i]?.focus()}
+          on:keydown={(event) => {
+            keyDown(event, attributesOffset + i)
+          }}
+          on:mouseover={() => {
+            elements[attributesOffset + i]?.focus()
+          }}
           on:click={() => {
             onAttribute(attr)
           }}
@@ -272,8 +296,12 @@
       {#each nested as object, i}
         <Submenu
           bind:element={elements[nestedOffset + i]}
-          on:keydown={(event) => keyDown(event, nestedOffset + i)}
-          on:mouseover={() => elements[nestedOffset + i]?.focus()}
+          on:keydown={(event) => {
+            keyDown(event, nestedOffset + i)
+          }}
+          on:mouseover={() => {
+            elements[nestedOffset + i]?.focus()
+          }}
           label={object.attribute.label}
           props={{
             context: object,
@@ -292,8 +320,12 @@
           <!-- svelte-ignore a11y-mouse-events-have-key-events -->
           <button
             bind:this={elements[relationsOffset + i]}
-            on:keydown={(event) => keyDown(event, relationsOffset + i)}
-            on:mouseover={() => elements[relationsOffset + i]?.focus()}
+            on:keydown={(event) => {
+              keyDown(event, relationsOffset + i)
+            }}
+            on:mouseover={() => {
+              elements[relationsOffset + i]?.focus()
+            }}
             on:click={() => {
               onRelation(object[1])
             }}
@@ -306,8 +338,12 @@
         {:else}
           <Submenu
             bind:element={elements[relationsOffset + i]}
-            on:keydown={(event) => keyDown(event, relationsOffset + i)}
-            on:mouseover={() => elements[relationsOffset + i]?.focus()}
+            on:keydown={(event) => {
+              keyDown(event, relationsOffset + i)
+            }}
+            on:mouseover={() => {
+              elements[relationsOffset + i]?.focus()
+            }}
             text={object[1].name}
             props={{
               context: object[1],
@@ -324,8 +360,12 @@
       {#each convertible as conv, i}
         <Submenu
           bind:element={elements[convertibleOffset + i]}
-          on:keydown={(event) => keyDown(event, convertibleOffset + i)}
-          on:mouseover={() => elements[convertibleOffset + i]?.focus()}
+          on:keydown={(event) => {
+            keyDown(event, convertibleOffset + i)
+          }}
+          on:mouseover={() => {
+            elements[convertibleOffset + i]?.focus()
+          }}
           label={getFunc(conv.func).label}
           props={{
             process,
@@ -344,8 +384,12 @@
       <!-- svelte-ignore a11y-mouse-events-have-key-events -->
       <button
         bind:this={elements[customValueIndex]}
-        on:keydown={(event) => keyDown(event, customValueIndex)}
-        on:mouseover={() => elements[customValueIndex]?.focus()}
+        on:keydown={(event) => {
+          keyDown(event, customValueIndex)
+        }}
+        on:mouseover={() => {
+          elements[customValueIndex]?.focus()
+        }}
         on:click={onConst}
         class="menu-item"
       >
diff --git a/plugins/process-resources/src/components/transformEditors/DateDifferenceEditor.svelte b/plugins/process-resources/src/components/transformEditors/DateDifferenceEditor.svelte
new file mode 100644
index 0000000000..9cd1e3cebc
--- /dev/null
+++ b/plugins/process-resources/src/components/transformEditors/DateDifferenceEditor.svelte
@@ -0,0 +1,107 @@
+<!--
+// Copyright © 2025 Hardcore Engineering Inc.
+//
+// Licensed under the Eclipse Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//
+// See the License for the specific language governing permissions and
+// limitations under the License.
+-->
+<script lang="ts">
+  import { MasterTag, Tag } from '@hcengineering/card'
+  import core, { AnyAttribute, Ref } from '@hcengineering/core'
+  import { getResource } from '@hcengineering/platform'
+  import presentation, { Card, getClient } from '@hcengineering/presentation'
+  import { Context, Process, ProcessFunction } from '@hcengineering/process'
+  import ui, { AnySvelteComponent, DropdownIntlItem, DropdownLabelsIntl } from '@hcengineering/ui'
+  import view from '@hcengineering/view'
+  import { createEventDispatcher } from 'svelte'
+  import ProcessAttribute from '../ProcessAttribute.svelte'
+  import { Analytics } from '@hcengineering/analytics'
+
+  export let func: ProcessFunction
+  export let process: Process
+  export let masterTag: Ref<MasterTag | Tag>
+  export let context: Context
+  export let attribute: AnyAttribute
+  export let props: Record<string, any> = {}
+
+  let otherDate = props?.otherDate
+  let unit = props?.unit ?? 'days'
+
+  const items: DropdownIntlItem[] = [
+    { id: 'hours', label: ui.string.Hours },
+    { id: 'days', label: ui.string.Days },
+    { id: 'weeks', label: ui.string.Weeks },
+    { id: 'months', label: ui.string.Months },
+    { id: 'years', label: ui.string.Years }
+  ]
+
+  const dispatch = createEventDispatcher()
+  const client = getClient()
+  const h = client.getHierarchy()
+
+  function save (): void {
+    dispatch('close', { otherDate, unit })
+  }
+
+  let editor: AnySvelteComponent | undefined
+
+  function getEditor (): void {
+    try {
+      const inlineEditor = h.as(h.getClass(core.class.TypeDate), view.mixin.AttributeEditor).inlineEditor
+      void getResource(inlineEditor)
+        .then((p) => {
+          editor = p
+        })
+        .catch((e: any) => {
+          Analytics.handleError(e)
+        })
+    } catch (e: any) {
+      Analytics.handleError(e)
+    }
+  }
+
+  getEditor()
+</script>
+
+<Card on:close width={'small'} label={func.label} canSave okAction={save} okLabel={presentation.string.Save}>
+  <div class="grid">
+    <ProcessAttribute
+      {process}
+      {masterTag}
+      {context}
+      attribute={{ ...attribute, label: ui.string.TargetDate }}
+      presenterClass={{
+        attrClass: core.class.TypeDate,
+        category: 'attribute'
+      }}
+      value={otherDate}
+      {editor}
+      on:change={(e) => {
+        otherDate = e.detail
+      }}
+    />
+    <div class="flex-row-center flex-gap-2">
+      <DropdownLabelsIntl {items} bind:selected={unit} />
+    </div>
+  </div>
+</Card>
+
+<style lang="scss">
+  .grid {
+    display: grid;
+    width: 100%;
+    grid-template-columns: 1fr;
+    grid-auto-rows: minmax(1rem, max-content);
+    justify-content: start;
+    align-items: center;
+    row-gap: 0.75rem;
+    height: min-content;
+  }
+</style>
diff --git a/plugins/process-resources/src/plugin.ts b/plugins/process-resources/src/plugin.ts
index 5d5c53eb17..74263da445 100644
--- a/plugins/process-resources/src/plugin.ts
+++ b/plugins/process-resources/src/plugin.ts
@@ -112,7 +112,8 @@ export default mergeIds(processId, process, {
     ReplaceEditor: '' as AnyComponent,
     SplitEditor: '' as AnyComponent,
     CutEditor: '' as AnyComponent,
-    FilterEditor: '' as AnyComponent
+    FilterEditor: '' as AnyComponent,
+    DateDifferenceEditor: '' as AnyComponent
   },
   transformPresenter: {
     NumberPresenter: '' as AnyComponent,
@@ -272,7 +273,8 @@ export default mergeIds(processId, process, {
     DateFromText: '' as IntlString,
     YearFromDate: '' as IntlString,
     MonthFromDate: '' as IntlString,
-    DayFromDate: '' as IntlString
+    DayFromDate: '' as IntlString,
+    DateDifference: '' as IntlString
   },
   permission: {
     RunProcess: '' as Ref<Permission>,
diff --git a/plugins/process-resources/src/utils.ts b/plugins/process-resources/src/utils.ts
index aa8ad98373..a77243257e 100644
--- a/plugins/process-resources/src/utils.ts
+++ b/plugins/process-resources/src/utils.ts
@@ -320,7 +320,7 @@ function getContextFunctions (
   const matched: Array<Ref<ProcessFunction>> = []
   const hierarchy = client.getHierarchy()
   const funcs = client.getModel().findAllSync(process.class.ProcessFunction, { type: 'context' })
-  for (const func of (funcs as unknown as ProcessFunction[])) {
+  for (const func of funcs as unknown as ProcessFunction[]) {
     switch (category) {
       case 'array': {
         if (func.category === 'array') {
diff --git a/plugins/process/src/index.ts b/plugins/process/src/index.ts
index 8629e1b890..d25283d2f5 100644
--- a/plugins/process/src/index.ts
+++ b/plugins/process/src/index.ts
@@ -385,6 +385,7 @@ export default plugin(processId, {
     YearFromDate: '' as Ref<ProcessFunction>,
     MonthFromDate: '' as Ref<ProcessFunction>,
     DayFromDate: '' as Ref<ProcessFunction>,
+    DateDifference: '' as Ref<ProcessFunction>,
     ExportProcess: '' as Resource<ExportFunc>,
     CheckProcessSectionVisibility: '' as Resource<(doc: Card) => Promise<boolean>>
   }
diff --git a/plugins/view-resources/src/components/list/ListCategories.svelte b/plugins/view-resources/src/components/list/ListCategories.svelte
index 8a0c03c646..3344c7e606 100644
--- a/plugins/view-resources/src/components/list/ListCategories.svelte
+++ b/plugins/view-resources/src/components/list/ListCategories.svelte
@@ -378,7 +378,7 @@
             : resultQuery[groupByKey]?.$in?.length !== 0
               ? undefined
               : []
-          : category ?? null
+          : (category ?? null)
     }
   }
 </script>
diff --git a/server-plugins/process-resources/src/index.ts b/server-plugins/process-resources/src/index.ts
index 0e544ad100..8de4079f78 100644
--- a/server-plugins/process-resources/src/index.ts
+++ b/server-plugins/process-resources/src/index.ts
@@ -97,7 +97,8 @@ import {
   DateFromString,
   YearFromDate,
   MonthFromDate,
-  DayFromDate
+  DayFromDate,
+  DateDifference
 } from './transform'
 import {
   RunSubProcess,
@@ -663,7 +664,8 @@ export default async () => ({
     DateFromString,
     YearFromDate,
     MonthFromDate,
-    DayFromDate
+    DayFromDate,
+    DateDifference
   },
   rollbacks: {
     ToDoCloseRollback,
diff --git a/server-plugins/process-resources/src/transform.ts b/server-plugins/process-resources/src/transform.ts
index dc085e68e6..5b28499b8d 100644
--- a/server-plugins/process-resources/src/transform.ts
+++ b/server-plugins/process-resources/src/transform.ts
@@ -246,6 +246,34 @@ export function Offset (val: Timestamp, props: Record<string, any>): Timestamp {
   return val
 }
 
+export async function DateDifference (
+  value: Timestamp,
+  props: Record<string, any>,
+  control: ProcessControl,
+  execution: Execution
+): Promise<number> {
+  if (typeof value !== 'number') return 0
+  const otherDate = await getContextValue(props.otherDate, control, execution)
+  if (typeof otherDate !== 'number') return 0
+
+  const diff = value - otherDate
+  const v = new Date(value)
+  const o = new Date(otherDate)
+  switch (props.unit) {
+    case 'hours':
+      return Math.floor(diff / (1000 * 60 * 60))
+    case 'weeks':
+      return Math.floor(diff / (1000 * 60 * 60 * 24 * 7))
+    case 'months':
+      return (v.getUTCFullYear() - o.getUTCFullYear()) * 12 + (v.getUTCMonth() - o.getUTCMonth())
+    case 'years':
+      return v.getUTCFullYear() - o.getUTCFullYear()
+    case 'days':
+    default:
+      return Math.floor(diff / (1000 * 60 * 60 * 24))
+  }
+}
+
 // #endregion
 
 // #region Numbers
@@ -508,4 +536,3 @@ export function DayFromDate (value: Date): number {
 }
 
 // #endregion
-
diff --git a/server-plugins/process/src/index.ts b/server-plugins/process/src/index.ts
index 13fb3b8687..673205e142 100644
--- a/server-plugins/process/src/index.ts
+++ b/server-plugins/process/src/index.ts
@@ -123,7 +123,8 @@ export default plugin(serverProcessId, {
     DateFromString: '' as Resource<TransformFunc>,
     YearFromDate: '' as Resource<TransformFunc>,
     MonthFromDate: '' as Resource<TransformFunc>,
-    DayFromDate: '' as Resource<TransformFunc>
+    DayFromDate: '' as Resource<TransformFunc>,
+    DateDifference: '' as Resource<TransformFunc>
   },
   trigger: {
     OnTransition: '' as Resource<TriggerFunc>,