"कल सोमवार है ।"

Translation: Tomorrow is Monday.

[H2PlaysYT]

How can we know if it is tomorrow or yesterday?

[MarcinM85]

It depends on the tense. If it is future (or present, like here), it means tomorrow. If it is past, then it means yesterday.

[benros1]

@MarcinM85 meant that ''है'' indicates that the tense is present.

[maz1269]

yes, so if this works like in english, then it's "tomorrow". tomorrow IS (present, not future, mind you), but yesterday WAS (necessarily past, never present)

[sandrayojana]

This sounds so sad in any language

[carsten858691]

It is sunday today and this comment really made me laugh, thank you.

[ph.SIA4UG]

था would indicate past tense