getdate: 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/bin/getdate - from package: wcstools

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

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