Questions & Answers about Ég var heppinn í dag.
Because var is the past tense of vera (to be).
- ég er = I am
- ég var = I was
So in Ég var heppinn í dag, var shows that the sentence is talking about being lucky earlier today or at some point today, not necessarily right now.
Var is the 1st person singular past tense form used with ég (I), but it is also the same past-tense form for he/she/it.
Examples:
- ég var = I was
- hann var = he was
- hún var = she was
- það var = it was
So Icelandic does not always have a different past-tense form for every person.