calendar task Dev

Question

a!localVariables(
 local!holidayslist: todate(text("12/25/2024", "mm/dd/yyyy")),
 local!select: {},
 local!monthnames: {
 "JANUARY",
 "FEBRUARY",
 "MARCH",
 "APRIL",
 "MAY",
 "JUNE",
 "JULY",
 "AUGUST",
 "SEPTEMBER",
 "OCTOBER",
 "NOVEMBER",
 "DECEMBER"
 },
 local!month: month(today()),
 local!year: year(today()),
 local!week: {
 "SUN",
 "MON",
 "TUE",
 "WED",
 "THU",
 "FRI",
 "SAT"
 },
 local!blank: a!forEach(
 items: enumerate(
 weekday(date(local!year, local!month, 1)) - 1
 ),
 expression: " "
 ),
 local!dates: append(
 local!blank,
 enumerate(daysinmonth(local!month, local!year)) + 1
 ),
 local!selectedDate: {},
 local!holidays: {
 if(
 a!isNullOrEmpty(local!holidayslist),
 {},
 text(local!holidayslist, "DD")
 )
 },
 local!currentMonth: {
 a!forEach(
 items: local!selectedDate,
 expression: if(
 tointeger(text(fv!item, "MM")) = local!month,
 text(fv!item, "dd"),
 {}
 )
 )
 },
 {
 a!cardLayout(
 contents: {
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!richTextDisplayField(
 labelPosition: "ABOVE",
 value: a!richTextItem(
 text: if(
 a!isNullOrEmpty(local!select),
 local!monthnames[local!month] & ", " & local!year,
 local!select[count(local!select)] & " " & local!monthnames[local!month] & ", " & local!year
 ),
 color: "STANDARD",
 size: "MEDIUM",
 style: "STRONG"
 ),
 preventWrapping: true,
 align: "CENTER",
 marginAbove: "STANDARD"
 )
 },
 width: "NARROW"
 ),
 a!columnLayout(
 contents: {
 a!cardLayout(
 contents: {
 a!dropdownFieldByIndex(
 label: "Month",
 labelPosition: "ABOVE",
 placeholder: "Select Month",
 choiceLabels: { local!monthnames },
 value: local!month,
 saveInto: { local!month },
 searchDisplay: "AUTO",
 validations: {}
 )
 },
 height: "AUTO",
 style: "NONE",
 marginBelow: "STANDARD",
 showBorder: false,
 showShadow: true
 )
 },
 width: "NARROW_PLUS"
 ),
 a!columnLayout(
 contents: {
 a!cardLayout(
 contents: {
 a!dropdownField(
 label: "Year",
 labelPosition: "ABOVE",
 placeholder: "Select Year",
 choiceLabels: enumerate(year(today()) + 10 - year(today())) + year(today()),
 choiceValues: enumerate(year(today()) + 10 - year(today())) + year(today()),
 value: local!year,
 saveInto: {
 local!year,
 a!save(
 local!blank,
 a!forEach(
 items: enumerate(weekday(1 / local!month / local!year, 1)),
 expression: " "
 )
 ),
 a!save(local!dates, null()),
 a!save(
 local!dates,
 append(
 local!blank,
 enumerate(daysinmonth(local!month, local!year)) + 1
 )
 )
 },
 searchDisplay: "AUTO",
 validations: {}
 )
 },
 height: "AUTO",
 style: "NONE",
 marginBelow: "STANDARD",
 showBorder: false,
 showShadow: true
 )
 },
 width: "NARROW_PLUS"
 )
 },
 alignVertical: "MIDDLE"
 ),
 a!columnsLayout(
 columns: {
 a!forEach(
 items: enumerate(length(local!week)) + 1,
 expression: a!columnLayout(
 contents: a!cardLayout(
 contents: a!richTextDisplayField(
 labelPosition: "ABOVE",
 value: {
 if(
 (fv!item = 1),
 a!richTextItem(
 text: index(local!week, fv!item, ""),
 color: "NEGATIVE",
 size: "STANDARD",
 style: "STRONG"
 ),
 (
 if(
 (fv!item = 7),
 a!richTextItem(
 text: index(local!week, fv!item, ""),
 color: "ACCENT",
 size: "MEDIUM",
 style: "STRONG"
 ),
 a!richTextItem(
 text: index(local!week, fv!item, ""),
 size: "MEDIUM",
 style: "STRONG"
 )
 )
 )
 )
 },
 align: "CENTER"
 ),
 shape: "ROUNDED",
 showShadow: true()
 )
 )
 )
 }
 ),
 a!forEach(
 items: enumerate(
 if(
 mod(length(local!dates), 7) = 0,
 quotient(length(local!dates), 7),
 sum(quotient(length(local!dates), 7) + 1)
 )
 ),
 expression: a!columnsLayout(
 columns: {
 a!forEach(
 items: (fv!item - 1) * 7 + enumerate(7) + 8,
 expression: a!columnLayout(
 contents: a!cardLayout(
 contents: if(
 index(local!dates, fv!item, " ") = " ",
 a!richTextDisplayField(
 value: a!richTextItem(
 text: index(local!dates, fv!item, ""),
 size: "SMALL"
 ),
 align: "CENTER"
 ),
 a!richTextDisplayField(
 value: a!richTextItem(
 text: index(local!dates, fv!item, ""),
 size: "SMALL"
 ),
 align: "CENTER"
 )
 ),
 link: if(
 and(index(local!dates, fv!item, " ") = " "),
 null(),
 if(
 or(
 contains(
 tointeger(local!currentMonth),
 tointeger(fv!item - count(local!blank))
 ),
 contains(
 tointeger(local!holidays),
 tointeger(fv!item) - count(local!blank)
 )
 ),
 null,
 a!dynamicLink(
 saveInto: {
 a!save(
 local!select,
 append(
 local!select,
 index(local!dates, fv!item, " ")
 )
 ),
 a!save(
 local!selectedDate,
 append(
 local!selectedDate,
 text(
 concat(
 local!month,
 "/",
 local!select[count(local!select)],
 "/",
 local!year
 ),
 "MM/DD/YYYY"
 )
 )
 ),
 
 }
 )
 )
 ),
 style: if(
 and(
 contains(
 tointeger(local!currentMonth),
 tointeger(fv!item) - count(local!blank)
 ),
 a!isNotNullOrEmpty(local!select)
 ),
 "ACCENT",
 if(
 and(
 index(local!dates, fv!item, " ") = day(today()),
 local!month = month(today()),
 local!year = year(today())
 ),
 "SUCCESS",
 if(
 contains(
 tointeger(local!holidays),
 tointeger(fv!item) - count(local!blank)
 ),
 "WARN",
 "NONE"
 )
 )
 ),
 shape: "ROUNDED",
 showBorder: index(local!dates, fv!item, " ") <> " "
 )
 )
 )
 }
 )
 )
 },
 height: "AUTO",
 style: "NONE",
 shape: "ROUNDED",
 padding: "STANDARD",
 marginBelow: "STANDARD",
 showShadow: true
 )
 }
) 
 
 Hi team New to appian iam learning how to create a calendar and now 
 i was facing issue in DEC 2024 cards are able to select. Iam confused where iam missing the logic. need suport with some Updated code and what is the reason for the card is selectable