dioddate: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/sbin/dioddate - from package: diod

You may install the required package with command apt-get install {package}

Error in other languages:
dioddate: bevel nie gevind nie
dioddate: comandă negăsită
dioddate: comando não encontrado
dioddate: commande introuvable
dioddate: command not found
dioddate: käsku ei ole
dioddate: không tìm thấy lệnh
dioddate: komanda nerasta
dioddate: Kommando nicht gefunden.
dioddate: kommandot finns inte
dioddate: komut yok
dioddate: nie znaleziono polecenia
dioddate: níor aimsíodh an t-ordú
dioddate: no se encontró la orden
dioddate: no s'ha trobat l'ordre
dioddate: opdracht niet gevonden
dioddate: parancs nem található
dioddate: perintah tidak ditemukan
dioddate: príkaz nenájdený
dioddate: příkaz nenalezen
dioddate: команда не найдена
dioddate: командата не е открита
dioddate: 命令找不到
dioddate: コマンドが見つかりません