Add a date variable in a Slack Workflow

Add a date variable in a Slack Workflow

Sonny Alves Dias

Published on Sep 27, 2021

3 min read

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One annoying thing that is not supported in Workflows yet is date. What a pity, to not have a date picker available in your workflow.

And even a variable that be the date time of when a form has been submitted. Fortunately, it is not hopeless.

By coding a workflow step ourselves, we can add a date!

So how❓

First, I would invite you to read that official tutorial from Slack:

In the tutorial, you can find a link to remix (fork) the glitch repo. So go ahead and remix it.

Then follow the to prepare your Slack app and the .env of the glitch.

One thing was not clear from the README is how to get the bot token. You actually need to go to OAuth & Permissions. Then install in workspace. Finally, you should copy that token which starts by xoxb-. image.png

Once you are all configured, let's code❗

Here is the code I use for my case, which is, I need the date of the submission of a form in a variable.

const { App, WorkflowStep } = require("@slack/bolt");

const app = new App({
  token: process.env.SLACK_BOT_TOKEN,
  signingSecret: process.env.SLACK_SIGNING_SECRET

const ws = new WorkflowStep("copy_review", {
  edit: async ({ ack, step, configure }) => {
    // NOTE: We don't show anything in the step UI window
  save: async ({ ack, step, update, view }) => {
    await ack();

    const inputs = {};

    // NOTE: We define a new output variable called date
    const outputs = [
        type: "text",
        name: "date",
        label: "Date"

    await update({ inputs, outputs });
  execute: async ({ step, complete, fail, client }) => {
    const today = new Date().toDateString();

    // NOTE: We assign a value to the variable date
    const outputs = {
      date: today

    await complete({ outputs });


// Project name listener for interactions with this select menu
app.action("project", async ({ ack, body, client }) => {
  await ack();

  try {
    const result = await client.views.update({
      // Pass the view_id
      // Pass the current hash to avoid race conditions
      hash: body.view.hash,
      // View payload with no update any blocks
      // Enable the submit/save button now that a project has been set
      view: {
        type: "workflow_step",
        // View identifier
        callback_id: "copy_review",
        // Using the same blocks, only updating the state of the submit/save button
        // Since none of the block or action ids were modified, any input
        // values set by the user are retained
        blocks: body.view.blocks,
        //Setting this to false will enable the button when the view is updated
        submit_disabled: false
  } catch (error) {

(async () => {
  // Start your app
  const port = process.env.PORT || 3000;
  await app.start(port);

  console.log(`⚑️ Get Date Bolt app is running on port ${port}!`);

Copy and paste that code in the file index.js of your Glitch.

That's it.

Finally ✨

Open the Slack Workflow Builder, add your step and use your date variable!

Note that Glitch apps goes to sleep after 5 minutes of inactivity. You can either purchase a pro account to remove that limitation or google to find alternative. Maybe the best option is to just to host the app yourself, but don't forget to update your Slack app configuration.

Photo by EstΓ©e Janssens on Unsplash

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