Convert Text to DateandTime

Did you try the todatetime() function?

https://docs.appian.com/suite/help/24.4/fnc_conversion_todatetime.html

Here are more functions in Appian: https://docs.appian.com/suite/help/24.4/Appian_Functions.html

Not able to get the desired output if i use only todatetime(). I think need to use more functions to get the exact value i am specifying.

If possible can you post the screenshot with the error

Its not working if reportdata is 

local!reportdata: {{c3: fn!datetime(2025, 1, 7, 5, 12, 2, 300), c0: "Workflow_00001_01-07-2025 12:00:35 PM", c1: 1, c2: "Process", dp1: null, dp0: 1055133, dp3: null, dp2: null}, {c3: fn!datetime(2025, 1, 3, 5, 20, 6, 410), c0: "Workflow_0001_01-03-2025 06:09:35 AM", c1: 1, c2: "Process", dp1: null, dp0: 1060892, dp3: null, dp2: null}, {c3: fn!datetime(2025, 1, 2, 12, 40, 13, 960), c0: "Workflow_0001_12-07-2022 06:09:35 AM", c1: 0, c2: "Process", dp1: null, dp0: 1060315, dp3: null, dp2: null}}

todatetime(substitute("12-07-2022 06:09:35 AM", "-", "/"))

Where is this value in the c0 field coming from? Why is it like this? Is there no way to get that date directly as an individual field?

Try  the below code

a!localVariables(
  local!reportdata: local!reportdata: {{c3: fn!datetime(2025, 1, 7, 5, 12, 2, 300), c0: "Workflow_00001_01-07-2025 12:00:35 PM", c1: 1, c2: "Process", dp1: null, dp0: 1055133, dp3: null, dp2: null}, {c3: fn!datetime(2025, 1, 3, 5, 20, 6, 410), c0: "Workflow_0001_01-03-2025 06:09:35 AM", c1: 1, c2: "Process", dp1: null, dp0: 1060892, dp3: null, dp2: null}, {c3: fn!datetime(2025, 1, 2, 12, 40, 13, 960), c0: "Workflow_0001_12-07-2022 06:09:35 AM", c1: 0, c2: "Process", dp1: null, dp0: 1060315, dp3: null, dp2: null}},
  a!forEach(
    items: local!reportdata,
    expression: if(a!isNotNullOrEmpty(fv!item), {
      taskName: fv!item.c2,
      Id: if(
        a!isNotNullOrEmpty(fv!item.c0),
        if(
          left(fv!item.c0, 3) = "PN",
          index(split(fv!item.c0, "_"), 3, null),
          index(split(fv!item.c0, "_"), 2, null)
        ),
        null
      ),
      SubDateTime: a!localVariables(
        local!date:split(fv!item.c0,"_"),
        todatetime(substitute(index(local!date,3,null),"-","/"))
      )
    }, null)
  )
)

its eliminating the seconds part from time and date time is not in a format mm/dd/yyyy hh:mm:ss AM/PM

date and time is part of a text and we need to extract date and time part and return in the same format as date and time data type

I asked that exact question already.

If the todatetime() function does not fit your needs, you will have to parse that string yourself using split().

its eliminating the seconds part from time and date time is not in a format mm/dd/yyyy hh:mm:ss AM/PM

its eliminating the seconds part from time and date time is not in a format mm/dd/yyyy hh:mm:ss AM/PM

Using this pattern, you can create your own date parsing expression.