First of all, thank you for your reply.
When I set the time on the timeline, it works, as I check afterwards with a variable, but my sprite stays at its starting point and doesn't move. My aim is to create a sun that, depending on the time of day, is positioned at a precise point when the game starts.
+ Système: Chaque tick
// Retrieves and converts hours, minutes and seconds (Variable Seconds)
-> Système: Définir Variable_Seconde à (TimeSystem.×3600)+(TimeSystem.×60)+Date.ObtenirSecondes(Date.Maintenant)
-> Texte_Variable_Seconde: Définir le texte à "Variable Seconde:"&Variable_Seconde
// Add (variable Timeline Soleil)
-> Système: Définir Variable_Timeline_Soleil à Variable_Seconde
-> Texte_Variable_Timeline_Soleil: Définir le texte à "Variable Timeline Soleil:"&Variable_Timeline_Soleil
// Retrieves the position of the sun (Variable Timeline)
-> Système: Définir Variable_Timeline à Variable_Timeline_Soleil
-> Texte_Variable_Timeline: Définir le texte à "Variable Timeline:"&Variable_Timeline