[HOLD for payment 2023-12-07] [$500] IOU - Cannot proceed to next month and dates appear blank when last day of month is selected

[kbecciv]

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Version Number: 1.4.3.0
Reproducible in staging?: y
Reproducible in production?: y
If this was caught during regression testing, add the test name, ID and link from TestRail:
Email or phone of affected tester (no customers):
Logs: https://stackoverflow.com/c/expensify/questions/4856
Expensify/Expensify Issue URL:
Issue reported by: Applause - Internal Team
Slack conversation:

Action Performed:

1. Navigate to staging.new.expensify.com.
2. Click FAB > Request money > Manual.
3. Enter amount, choose participant and proceed to confirmation page.
4. Click Show more > Date.
5. Choose the date 31st Oct.
6. Go to November.
7. Choose the date 30th Sept.
8. Go to October.

Expected Result:

In Step 6, user should be able to go to November.
In Step 8, no blank dates will be shown.

Actual Result:

In Step 6, user is unable to go to November.
In Step 8, blank dates are shown.

Workaround:

Unknown

Platforms:

Which of our officially supported platforms is this issue occurring on?

• Android: Native
• Android: mWeb Chrome
• iOS: Native
• iOS: mWeb Safari
• MacOS: Chrome / Safari
• MacOS: Desktop

Screenshots/Videos

Add any screenshot/video evidence

Bug6288891_1700768927135.bandicam_2023-11-24_02-23-21-687.mp4

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Upwork Automation - Do Not Edit

• Upwork Job URL: https://www.upwork.com/jobs/~01cc0d157099a8bbaa
• Upwork Job ID: 1727778969100070912
• Last Price Increase: 2023-11-23
• Automatic offers:
• s77rt | Reviewer | 27845856
• paultsimura | Contributor | 27845858

[melvin-bot]

Job added to Upwork: https://www.upwork.com/jobs/~01cc0d157099a8bbaa

[melvin-bot]

Triggered auto assignment to @miljakljajic (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details.

[melvin-bot]

Bug0 Triage Checklist (Main S/O)

• This "bug" occurs on a supported platform (ensure Platforms in OP are ✅)
• This bug is not a duplicate report (check E/App issues and #expensify-bugs)
  • If it is, comment with a link to the original report, close the issue and add any novel details to the original issue instead
• This bug is reproducible using the reproduction steps in the OP. S/O
  • If the reproduction steps are clear and you're unable to reproduce the bug, check with the reporter and QA first, then close the issue.
  • If the reproduction steps aren't clear and you determine the correct steps, please update the OP.
• This issue is filled out as thoroughly and clearly as possible
  • Pay special attention to the title, results, platforms where the bug occurs, and if the bug happens on staging/production.
• I have reviewed and subscribed to the linked Slack conversation to ensure Slack/Github stay in sync

[melvin-bot]

Triggered auto assignment to Contributor-plus team member for initial proposal review - @s77rt (External)

[paultsimura]

Proposal

Please re-state the problem that we are trying to solve in this issue.

What is the root cause of that problem?

The issue is that in the CalendarPicker, we check if there are available dates next month by the following logic:

App/src/components/NewDatePicker/CalendarPicker/index.js

Lines 130 to 131 in d521dd6

	const hasAvailableDatesNextMonth = startOfDay(endOfMonth(new Date(this.props.maxDate))) > addMonths(new Date(this.state.currentDateView), 1);
	const hasAvailableDatesPrevMonth = startOfDay(new Date(this.props.minDate)) < endOfMonth(subMonths(new Date(this.state.currentDateView), 1));

Here, if the next month has <= days than the selected day number, we compare the start of the day with the end of the same day (end of next month):

App/src/components/NewDatePicker/CalendarPicker/index.js

Line 187 in d521dd6

disabled={!hasAvailableDatesNextMonth}

What changes do you think we should make in order to solve the problem?

We should simplify this logic to avoid unnecessary chained calculations and only check if the max allowed date is after the end of the current month. This would mean that there are available dates next month – at least the props.maxDate will be available. We should also modify the navigation to the previous month in a similar way.

const hasAvailableDatesNextMonth = startOfDay(new Date(this.props.maxDate)) > endOfMonth(new Date(this.state.currentDateView));
const hasAvailableDatesPrevMonth = endOfDay(new Date(this.props.minDate)) < startOfMonth(new Date(this.state.currentDateView));

Also, we'll need to prevent the non-existing days from being falsely marked as "selected" when navigating, so we should also add a !!day (or even !isDisabled) check here:

const isSelected = !!day && isSameDay(parseISO(this.props.value), new Date(currentYearView, currentMonthView, day));

App/src/components/NewDatePicker/CalendarPicker/index.js

Lines 218 to 222 in d521dd6

	const currentDate = new Date(currentYearView, currentMonthView, day);
	const isBeforeMinDate = currentDate < startOfDay(new Date(this.props.minDate));
	const isAfterMaxDate = currentDate > startOfDay(new Date(this.props.maxDate));
	const isDisabled = !day || isBeforeMinDate || isAfterMaxDate;
	const isSelected = isSameDay(parseISO(this.props.value), new Date(currentYearView, currentMonthView, day));

Result:

Screen.Recording.2023-11-23.at.22.34.49.mov

What alternative solutions did you explore? (Optional)

[rakshitjain13]

Proposal

Please re-state the problem that we are trying to solve in this issue.

Cannot proceed to next month and dates appear blank when the last day of the month is selected

What is the root cause of that problem?

Here will check for next month button should show or not, we are checking with the start time of the max date (last date of the current month) which cause the problem

App/src/components/NewDatePicker/CalendarPicker/index.js

Line 130 in 7a68a3d

const hasAvailableDatesNextMonth = startOfDay(endOfMonth(new Date(this.props.maxDate))) > addMonths(new Date(this.state.currentDateView), 1);

What changes do you think we should make in order to solve the problem?

Here we should use the end of the day time instead of start time of max date

const hasAvailableDatesNextMonth = endOfDay(endOfMonth(new Date(this.props.maxDate))) > addMonths(new Date(this.state.currentDateView), 1);

What alternative solutions did you explore? (Optional)

NA

[s77rt]

@paultsimura Thanks for the proposal. Your RCA is correct and the solution looks good to me 👍.

PS: When raising a PR please add test case in CalendarPickerTest.js to prevent this from happening again.

🎀 👀 🎀 C+ reviewed
Link to proposal