The following Activity works - using Java Steps.

You might want to re-factor this into a Function (or two functions I guess)  : or at least re-factor into a single Activity rather than the two I'm using here (one that using Params, the other using Pages - which calls the first one).

Additionally: I decided to split the Date and Time Components into a PRPC 'Date' Property and a PRPC 'TimeOfDay' Property - this is because these two types have simple well-defined internal-storage formats in the help:

See: (prpchost:port)://prhelp/procomhelpmain.htm#concepts/concepts2/conceptsdatetime.htm

The internal representations

The internal representation of a Date value is eight digits in the format YYYYMMDD, for example 20061215 for December 15, 2006.

The internal representation of Time of Day value is six digits in the format HHMMSS, where the hours portion ranges from 00 to 23. For example, 153025 represents 25 seconds after 3:15 P.M.

Additionally the PRPC help page:

(prpchost:port)://prhelp/procomhelpmain.htm#designer studio/expressionbuilder/ref_conversions.htm

Has a Table showing different 'casting' operations allowed in Pega7 : and for Text->Date, and Text->TimeOfDay; the casting operation is marked as 'C'.

Which means:

Copies the value without examining whether it is valid.

So it's on us to make sure the Text Property being cast to Date/TimeOfDay is really what we need it to be.

I'm using the Joda Time Library : but this is already included in PRPC - so no need to import anything.

Joda Time has two simple types called 'LocalDate' and 'LocalTime' - which are conceptually the same as a PRPC 'Date' and a PRPC 'TimeOfDay' (They represent just a date and just a time only : no timezones to complicate things).

They also provide validation checks: including rejecting non-existant dates (2015-02-29 will fail [not a leap year], whereas 2016-02-29 is fine [is a leap year]) for instance).

Java Steps are shown below - First Date and then Time:

try {
    org.joda.time.LocalDate localdate=new org.joda.time.LocalDate(InDateString);
    outDateString=localdate.toString("YYYYMMdd");

}
catch(Exception e) {
    throw new PRRuntimeException(e);
}

[NOTE : See my REPLY below for a slight correction to this (the ':' shouldn't be here)  - although this step apparently still worked as-is]

try {
    org.joda.time.LocalTime localtime=new org.joda.time.LocalTime(InTimeString);
    outTimeString = localtime.toString("HH:mm:ss");
}
catch(Exception e) {
    throw new PRRuntimeException(e);
}

I have switched on a JUMP step upon exception for both these steps - just jumps to the END of the Activity.

You might want to change this so that it 'dirties' the page rather than chuck an exception - dunno.

[But it's better that it flags the error when it happens rather than finding out later that the date is set to 1970-01-01 I think]

And here's my second testing Activity - which just calls the first: and sets Properties on a Page.

I have three Properties defined on my class here: 'MyInputString' , 'MyDateProp' and 'MyTimeProp'.

They are 'Text', 'Date' and 'TimeOfDay' respectively.

Here's my Page after running it:

<pagedata>
<MyInputString>2016-02-02 13:29:23</MyInputString>
<MyTimeProp>132923</MyTimeProp>
<pxObjClass>Tmp-scratch-Work</pxObjClass>
<MyDateProp>20160202</MyDateProp>
<pzStatus>valid</pzStatus>
</pagedata

The Activity is essentially hardcoded to only accept dates exactly in the format you have (an ISO-8601 format I believe).