Close to midnight, say

• Around 11 p.m., perhaps
• Toward midnight, say
• Not exactly on time
• Kinda tardy
• Somewhat tardy
• Somewhat behind schedule
• Nearing bedtime
• A little behind

Wiktionary Word definitions in Wiktionary
a. Sort of late.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Latish \Lat"ish\, a. Somewhat late. [Colloq.]