idate: 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/idate - from package: itools

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

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