Can't use page.date.toUTCString() in Liquid template

[codeinpink]

Describe the bug
The docs on using dates in templates (https://www.11ty.io/docs/dates/) suggests using {{ page.date.toUTCString() }} to display a UTC time zone date, but when I try to do that it displays function toUTCString() { [native code] } instead of the actual date.

To Reproduce
Steps to reproduce the behavior:

1. Attempt to use {{ page.date.toUTCString() }} in your template

Expected behavior
It should display the date.

Screenshots

Environment:

• OS and Version: Ubuntu 16.04.5 LTS
• Eleventy Version: 0.8.3

Additional context
I'm using the default template engine (liquid) but I've also tried using nunjucks. I also get the same results for toString(). Seems related to #447

[zachleat]

I was able to reproduce this in Liquid but Nunjucks seems to operate just fine.

[zachleat]

Hmm, I’m not sure this is a bug—I don’t think Liquid supports calling functions like this. I will update the documentation to be more accurate—sorry about that!

[zachleat]

(The accepted method for this in Liquid is to use a custom filter to output the correct string format for the date )

https://www.11ty.io/docs/filters/

[zachleat]

Docs updated! https://www.11ty.io/docs/dates/#dates-off-by-one-day