middagstid

middag (“midday, dinner”) +‎ -s- +‎ tid (“time”)

middagstid c

1. at (around) noon

   Synonyms: middag, mitt på dagen, klockan tolv, tolvtiden, tolvsnåret

   Vi kommer dit framåt middagstid

   We'll get there around noon ("towards noon")

   De brukar dyka upp varje dag vid middagstid

   They usually show up each day around noon

2. when dinner (middag) is eaten, dinner time

   Vi har ingen fast middagstid

   We don't have a fixed dinner time

Dinner also being called middag seems to have led to some confusion in modern times, when dinner is usually eaten later in the day. The dinner time sense only appears in SAOB, but seems fairly common in practice. See also the discussion page on Swedish Wiktionary. Likely to be clear from context.

• middagstid in Svensk ordbok (SO)
• middagstid in Svenska Akademiens ordbok (SAOB)