# Formula reference is wrong "Weekday(date)" should be "IsoWeekday(date)"

**URL:** https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457
**Category:** Bugs & Issues
**Created:** [August 24, 2025, 10:57am UTC](https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457 "2025-08-24T10:57:00Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![RonMakesSystems](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/ronmakessystems/32/14122_2.png) [@RonMakesSystems](https://community.fibery.io/u/RonMakesSystems)
#### Post date: [August 24, 2025, 10:57am UTC](https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457/1 "2025-08-24T10:57:00Z")

</div>

Formula reference is wrong “Weekday(date)” should be “IsoWeekday(date)”

---

<div class="post-metadata">

### Author: ![itsu](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/itsu/32/1775_2.png) [@itsu](https://community.fibery.io/u/itsu)
#### Post date: [August 24, 2025, 12:56pm UTC](https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457/2 "2025-08-24T12:56:59Z")

</div>

Can you please elaborate? Where do you see `Weekday(date)`?

---

<div class="post-metadata">

### Author: ![Chr1sG](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/chr1sg/32/3941_2.png) [@Chr1sG](https://community.fibery.io/u/Chr1sG)
#### Post date: [August 24, 2025, 1:22pm UTC](https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457/3 "2025-08-24T13:22:23Z")

</div>

I assume you mean in our user guide. I’ve just updated it, thanks.

---

<div class="post-metadata">

### Author: ![RonMakesSystems](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/ronmakessystems/32/14122_2.png) [@RonMakesSystems](https://community.fibery.io/u/RonMakesSystems)
#### Post date: [August 24, 2025, 2:46pm UTC](https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457/4 "2025-08-24T14:46:43Z")

</div>

Yes! Sorry it wasn’t clear. I still see the example is using the old syntax:

Weekday(Today()) → 4

Should be:

IsoWeekday(Today()) → 4

I gave an AI the formula reference for help and it was using Weekday(), thats how I realised the issue.

Thanks!

---

<div class="post-metadata">

### Author: ![Chr1sG](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/chr1sg/32/3941_2.png) [@Chr1sG](https://community.fibery.io/u/Chr1sG)
#### Post date: [August 24, 2025, 5:10pm UTC](https://community.fibery.io/t/formula-reference-is-wrong-weekday-date-should-be-isoweekday-date/9457/5 "2025-08-24T17:10:22Z")

</div>