Looking on the internet deeply has found these results:

in early January is the most popular phrase on the web.

on early January 147,400 results on the web	in early January 14,490,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	V Two MSF aid workers were killed in early January while implementing emergency assistance projects in the Somali capital Mogadishu. Bird was liquidated in early January 2005. Many Members of this House were able, in early January, to see with what pride the Palestinian people organised these democratic elections. The most recent outbreaks of ethnic violence in Mitrovica in early January this year were potentially serious but were contained. 14 calls to Rome in early January, 17 calls to Berlin in March, In early January the Commission pledged to introduce new measures to support the dairy sector and producers' incomes across Europe in an effort to combat some of the negative effects the current economic crisis is having on the dairy sector. The Air&Sea activities in the Netherlands were so consolidated in early January 2005.

on early January

147,400 results on the web

in early January

14,490,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

V
Two MSF aid workers were killed in early January while implementing emergency assistance projects in the Somali capital Mogadishu.
Bird was liquidated in early January 2005.
Many Members of this House were able, in early January, to see with what pride the Palestinian people organised these democratic elections.
The most recent outbreaks of ethnic violence in Mitrovica in early January this year were potentially serious but were contained.
14 calls to Rome in early January, 17 calls to Berlin in March,
In early January the Commission pledged to introduce new measures to support the dairy sector and producers' incomes across Europe in an effort to combat some of the negative effects the current economic crisis is having on the dairy sector.
The Air&Sea activities in the Netherlands were so consolidated in early January 2005.