date@: 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/date@ - from package: ucspi-tcp-ipv6
/usr/bin/date@ - from package: ucspi-tcp

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

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