The infinitive does not indicate tense. The infinitive is the form that is found in dictionaries. Most often the infinitive ends in -e.
| blive, skrive, læse, huske | stay, write, read, remember |
But we also find infinitives that do not end in -e.
| dø, gå, få, stå, bo | die, walk, get, stand, live |
Comparison:
In English the infinitive has no common ending. The infinitive is the base form that constitutes the basis for the rest of the conjugation forms of a particular verb.