This is the 199th most frequent Swedish word.
dags
"Dags" means "time for" or "time to" in English.
The word 'dags' signifies that it is the proper time for an action to occur, which is specified as 'att gå hem' (to go home).
Det är dags att gå hem.
It is time to go home.
Here 'dags' indicates that it is an appropriate time to proceed with having dinner, as introduced by 'för' (for) to specify an event or activity.
Nu är det dags för middag.
Now it is time for dinner.
In this context, 'dags' is used to announce or signify the occurrence of a recurring event — the summer sale in this case.