Translation:This afternoon I search for my chicken.
Afternoon begins at 12:01 PM, so it's not a precise match for "siang" (which, as I understand, begins around 10-11 am).
Halo teman! The word "siang" is translated to English as "morning" (in the time period from 10 am to 12 am) and "afternoon" (in the time period from 12.01 pm to 15 pm) as well. Then, the speaker would use the translation that can fit well in a context.
Selamat belajar! :)