"The morning of" functions as an adjectival phrase clarifying the specific time and date "on 19 April 2016". "On" is used because it belongs to the date here, specific part of the day.
The normal language constructions would be:
on + date (with the year or without it) or day of the weekin + morning, afternoon, evening (in the morning, in the evening)
But, when we talk about a specific morning, afternoon, or when we describe the part of the day it should be used with on:
on the morning of ,
You can"t say "I will see you on the morning" - it"s incorrect.
here"s the proof: http://dictionary.cambridge.org/grammar/british-grammar/at-on-and-in-time
In or on?
We use in with morning, afternoon, evening và night, but we use on when we talk about a specific morning, afternoon, etc., or when we describe the part of the day.
Share Improve this answer Follow edited Jun 15 "20 at 7:40
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