IN
Use in for nonspecific times during a day, a month, a season, or a year.
- Times of the day: in the morning, in the afternoon, in the evening (but, we say at night)
 - I like to go jogging in the morning.
 - I like to take a nap in the afternoon.
 - Month: in May, in January, in March
 - I will start looking for a job in May.
 - The days are short in December.
 - Season: in winter, in spring
 - There is so much pollen in spring.
 - The cherry blossoms will bloom in spring.
 - Years: in 1978, in 2004
 - More than 771,000 business travelers visited Australia in 2005.
 - Jenkins came to Japan in 2004.
 - Her album was released in 2004.
 
- Decade: in the twenties, in the '90s
 - Future: in a few weeks, in a couple of days, in six hours
 
Use about the + date (for approximate dates):
- about the 25th of December
 
- around the 25th of December
 
- Days of week: on Friday, on Monday, on Sundays
 - The expo begins on Friday.
 - Calendar days: on New Year's Day, on Christmas Day
 - I stayed home on New Year's Day.
 - Use on + ordinal of the day: on October 22nd, on April the 19th
 - I will see you on Tuesday the 6th.
 - Weekend(s): on the weekend, on weekends
 
- Precise time: at 7 o'clock, at 6:15, at six o'clock, at 10:30, at two p.m.
 - My flight departs at 2:30 p.m.
 - The movie will start at 8:00.
 - Night: at night
 - Specific places: at school, at Roppongi Hills, at Starbucks
 - Weekend(s): at the weekend, at weekends (British English)
 
- Use of in this structure: at + the + a particular time in a week/month/year
 - Meet me at a quarter of four. (Meet me at 3:45)
 - I felt sick at the end of the week.
 - I will quit my new job at the start of July.
 - I graduated in the fall of 2005.
 - I studied ikebana from August through November of 2005.
 
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