<input type="datetime-local" name="arrival_date" value="<?php echo date('Y-m-d\TH:i', time() + 86400); ?>" required/>
<input type="submit" value="Valider">
</form>
<input type="datetime-local" name="arrival_date" value="<?php echo date('Y-m-d\TH:i', time() + 86400); ?>" required/>
<input type="submit" value="Valider">
</form>