CORRECT USAGE: AT, IN, ON

Prepositions  of TIME AT, ON, and IN. 

AT- usually sa exact time like at 7pm, at 3 oçlock, etc...

ON - is used with days and dates like on January 2, on Monday, on Tuesday, on the 4th of April, ganun.....

IN - is used with months and years like in April, in June, in 1990, in 2017...etc....

prepositions of LOCATION, AT, ON, and IN. 

.AT- usually sa specific point like at the center, at the corner, and in addresses usually pag may number si house like

 I live at #3 Roxas street, etc...

ON - is used with surfaces like on the wall, on the floor, on the table, on the ground, and in addresses usually paag name lang ng street, avenue, road like 

I Live on Roxas street, I live on Roxas avenue ganun.....

IN - is used when the thing is inside the boxlike structure like in the kitchen, in the room, in the hall..with addresses naman use IN with cities, places like in Seoul, in the Philippines, in Mindanao, etc....