Date compare is null

Question

Hi, I want to have a ri!startDate, I will use the a!isNotNull function to display some warning message if the ri!startDate is null else will retrieve the weekday(ri!startDate) 
 
 but I keep encountering the error message such as Cannot sub incompatible operands of type Date and type Text.

below here is my code for the interface

a!localVariables(
 local!weeknum:if(a!isNotNullOrEmpty(ri!startDate),weeknum(ri!startDate),{}),
 local!day:if(a!isNotNullOrEmpty(ri!startDate),day(ri!startDate),{}),
 local!month:if(a!isNotNullOrEmpty(ri!startDate),month(ri!startDate),{}),
 local!year:if(a!isNotNullOrEmpty(ri!startDate),year(ri!startDate),{}),
 local!dayofWeek:if(ri!startDate=null(),"Please Select a Date ", weekday(ri!startDate)-1),
 local!startWeekDay:if(local!dayofWeek<>1,ri!startDate-local!dayofWeek+1,{}),
 local!endWeekDay:local!startWeekDay+4,
 local!monday:local!startWeekDay,
 local!tuesday:local!startWeekDay+1,
 local!wednesday:local!startWeekDay+2,
 local!thursday:local!startWeekDay+3,
 local!friday:local!startWeekDay+4,
 
 
a!formLayout(
 label: "Form",
 contents: {
 a!sectionLayout(
 contents: {
 a!dateField(
 label: "Start Date",
 labelPosition: "ABOVE",
 value:today(),
 saveInto: ri!startDate,
 validations: {}
 )
 }
 ),
 a!integerField(
 label: local!monday,
 labelPosition: "JUSTIFIED",
 saveInto: {},
 refreshAfter: "UNFOCUS",
 validations: {}
 ),
 a!integerField(
 label: local!tuesday,
 labelPosition: "JUSTIFIED",
 saveInto: {},
 refreshAfter: "UNFOCUS",
 validations: {}
 )

 },
 buttons: a!buttonLayout(
 primaryButtons: {
 a!buttonWidget(
 label: "Submit",
 submit: true,
 style: "PRIMARY"
 )
 },
 secondaryButtons: {
 a!buttonWidget(
 label: "Cancel",
 value: true,
 saveInto: ri!cancel,
 submit: true,
 style: "NORMAL",
 validate: false
 )
 }
 )
)
)

virat yogi · Accepted Answer

Hello 
 Below is the fixed code 
 a!localVariables(
 local!weeknum: if(
 a!isNotNullOrEmpty(ri!startDate),
 weeknum(ri!startDate),
 {}
 ),
 local!day: if(
 a!isNotNullOrEmpty(ri!startDate),
 day(ri!startDate),
 {}
 ),
 local!month: if(
 a!isNotNullOrEmpty(ri!startDate),
 month(ri!startDate),
 {}
 ),
 local!year: if(
 a!isNotNullOrEmpty(ri!startDate),
 year(ri!startDate),
 {}
 ),
 local!dayofWeek: if(
 isnull(ri!startDate),
 "Please Select a Date ",
 weekday(ri!startDate) - 1
 ),
 local!startWeekDay: if(
 isnull(ri!startDate),
 0,
 if(
 local!dayofWeek <> 1,
 ri!startDate - local!dayofWeek + 1,
 {}
 )
 ),
 local!endWeekDay: local!startWeekDay + 4,
 local!monday: local!startWeekDay,
 local!tuesday: local!startWeekDay + 1,
 local!wednesday: local!startWeekDay + 2,
 local!thursday: local!startWeekDay + 3,
 local!friday: local!startWeekDay + 4,
 a!formLayout(
 label: "Form",
 contents: {
 a!sectionLayout(
 contents: {
 a!dateField(
 label: "Start Date",
 labelPosition: "ABOVE",
 value: today(),
 saveInto: ri!startDate,
 validations: {}
 )
 }
 ),
 a!integerField(
 label: local!monday,
 labelPosition: "JUSTIFIED",
 saveInto: {},
 refreshAfter: "UNFOCUS",
 validations: {}
 ),
 a!integerField(
 label: local!tuesday,
 labelPosition: "JUSTIFIED",
 saveInto: {},
 refreshAfter: "UNFOCUS",
 validations: {}
 )
 },
 buttons: a!buttonLayout(
 primaryButtons: {
 a!buttonWidget(
 label: "Submit",
 submit: true,
 style: "PRIMARY"
 )
 },
 secondaryButtons: {
 a!buttonWidget(
 label: "Cancel",
 value: true,
 saveInto: ri!cancel,
 submit: true,
 style: "NORMAL",
 validate: false
 )
 }
 )
 )
) 
 
 Changes I have done 
 1. local!dayofWeek - cannot comapre ri!startDate with null() as the type of ri!startDate is Date , hence we need to use isNull() function to check if it is null. 
 2. local!startWeekDay - if ri!startDate is null we local!dayofWeek holds a text value hence no mathematical operations can be done on it, so I have added a null check and set the value to zero if ri!startDate is null. 
 
 Hope this helps.

Date compare is null

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