Add various utility date related expression functions

[PerikiyoXD]

I'd like to have weekday(), year(), day(), month() functions as defaults

Are you requesting a feature, reporting a bug or asking a question?

A feature

What is the current behavior?

What is the expected behavior?

Have default expression functions for:

• Year: year() -> '2023'
• Day Number: day() -> '19'
• Month: month() -> 'January'
• Week Day: weekday() -> 'Monday'

How would you reproduce the current behavior (if this is a bug)?

Provide the test code and the tested page URL (if applicable)

Tested page URL:

Test code

your_code_here

Specify your

• browser:
• browser version:
• surveyjs platform (angular or react or jquery or knockout or vue):
• surveyjs version:

[PerikiyoXD]

I know I can implement custom functions myself, but I think having these functions by default wouldn't hurt and would be good enough by default, since "today()" is just a raw JS date. Adding those functions would allow easy string construction for some contexts that need date handling.

[PerikiyoXD]

I think having these functions:

• currentMonthName
• currentDayName
• currentDay

is enough to handle most date building cases.

You can suggest other names if these don't really make much sense, as probably there are better alternatives.

[PerikiyoXD]

Thanks for adding the requested functionality!

Although, I would like to ask one more thing on this topic. If you have a look at the commit I created that didn't make it to the PR (fafb62c), I added "names" related to dates.

I didn't clarify the reason behind the utility functions request.
The end goal was to generate a string like "Monday, July 20, 2023" in an expression question.

Anyways, we got half of the requested functions.
I hope you can take a look at the commit again and implement the name-related functions.

Thank you!