About preposition
I was born on June 25th.
I was both in June. Are they both correct? If I indicate the date, I need to use “on” instead of “in”, right?

Question

About preposition
I was born on June 25th. 
I was both in June. Are they both correct? If I indicate the date, I need to use “on” instead of “in”, right?

Answer

https://www.google.com/search?q=preposition+triangle&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiLxrPY4MviAhUkVBUIHS_nA_gQ_AUIECgB&biw=1366&bih=625#imgrc=LPmp06-XHss1dM:

If you can click on this link there is a REALLY GOOD TRIANGLE picture which helps you with prepositions of TIME and PLACE! Good luck! Helen

Answer

Yes. 'on' is more specific than 'in'. If you have more information (i.e the day and month) use 'on'.

Answer

'on' for days and full dates 
on Tuesday
on  the 25th of June (FOR DATES ALWAYS USE 'the' and 'of'.....THE 27th OF July) These, however, aren't always written. In British English (which is what I'm referring to here), we write: "22nd March" BUT we SAY 'the 22nd of March'.
In American English this is slightly different.

'in' for months, years and seasons
in August
in 1987
in winter

Answer

X happened (any time) in a month.
X happened on a specific day.
.
The fourth of July is an American Holiday.
It's on the fourth of July; on the fourth.
It's in July.