With the increasing penetration of hydrogen energy into energy systems, active distribution networks (ADNs) can operate more flexibly and resiliently. Under extreme events, the hydrogen-penetrated ADN (HADN) can be islanded as microgrids (MGs) by fully exploiting the distributed generators and hydrogen energy. To achieve this target, in this work, a robust MG formulation strategy is proposed for the HADN. Both the coordination of hydrogen energy with renewables and hydrogen transit are integrated for resilient MG formation. To address the spatial-temporal correlations between the locations of hydrogen refueling stations (HRSs), the transportation network (TN) and the hydrogen transit time, a TN-free hydrogen transit model is presented based on temporal distances between HRSs. To tackle uncertainties such as load demands, output power of renewables, and the temporal distances between HRSs, both the stochastic programming and the information gap decision theory (IGDT) are applied to derive a robust MG formation model. Since uncertain temporal distances are difficult to manage and incorporate directly for robust MG formation, an equivalent linear reformulation of the TN-free hydrogen transit model is presented to facilitate the integration of hydrogen transit into the MG formation problem. Simulations on a HADN in China and a modified IEEE 123-bus distribution system validate the effectiveness of the robust MG formation strategy for HADN.