You will be given a definition of a task first, then some input of the task.
Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

In the morning of 19 April 2016, Taliban militants attacked a security team. Or On the morning of 19 April 2016, Taliban militants attacked a security team .
Output:
'on' is the correct preposition and 'in' is the incorrect one for this case. '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 week in + 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 [date], You can't say 'I will see you on the morning' - it's incorrect. In or on? We use in with morning, afternoon, evening and night, but we use on when we talk about a specific morning, afternoon, etc., or when we describe the part of the day.