date filter should return parsed input when no format is provided

[sebastienros]

Expected:

Actual:
https://liquidjs.com/playground.html#e3sgJ25vdycgfCBkYXRlIH19Cnt7ICcyMDIyLTEyLTA3VDIyOjIyOjE4JyB8IGRhdGUgfX0K,e30=

[harttle]

Actually in my local shopify/liquid, it yields an error:

liquid/lib/liquid/standardfilters.rb:681:in `date': wrong number of arguments (given 1, expected 2) (ArgumentError)

But I do think it's better to output something instead of throwing. Now what I can find in JavaScript (with most similarity) is Date.toString(), what do you think?

> (new Date()).toString()
Thu Dec 22 2022 22:40:58 GMT+0800 (Taipei Standard Time)'

[harttle]

Date.toString()

I find this approach is not feasible for TimezoneDate. Now I'm trying to set the default format string to '%A, %B %-e, %Y at %-l:%M %P %z' when it's not provided, so that the use case you provided can pass the test.

It seems OK in this test case:

liquidjs/test/integration/filters/date.ts

Lines 70 to 72 in 3f21382

	it('should support timezone without format', function () {
	return test('{{ "2022-12-08T03:22:18.000Z" | date: nil, "America/Cayman" }}', 'Wednesday, December 7, 2022 at 10:22 pm -0500')
	})

The timezone is specified so that this test case can be env independant, more realistic use case is:

liquidjs/test/integration/filters/date.ts

Lines 9 to 11 in 3f21382

	it('should support "now"', function () {
	return test('{{ "now" | date }}', /\w+, January \d+, 2023 at \d+:\d\d [ap]m [-+]\d\d\d\d/)
	})