fix(theme): show day in today's date

[lexzhukov]

Please read and mark the following check list before creating a pull request:

• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

Fix #615

[Tibing]

I think the date has to be rendered considering custom locale. Maybe, we will just use default Angular date pipe for this purpose?

[Tibing]

Also, I'm not sure we need custom pipe at all. Could we use default Angular date pipe instead? What do you think?

[lexzhukov]

Also, I'm not sure we need custom pipe at all. Could we use default Angular date pipe instead? What do you think?

I agree. It's good practice.