As a foreigner, always be punctual for your business meetings. Colombians may arrive 15 minutes late for the meeting but expect you to be on time. This is just normal protocol.
Business appointments are made in advance, preferably one week before arriving.
Colombians write their calendar date similar to many European and other South American countries. Write the day first, then the month, then year (i.e., April 11, 2010 is written 11-4-10).
Lunch is the preferred choice for a business meal.
Business hours are generally from 9:00 AM to 5:00PM Monday through Friday.
Store hours generally are from 9:00 AM to 12:30 PM and from 2:00 PM to 7:00 PM Monday through Saturday.
Bank hours are from 9:00 AM to 3:00 PM Monday through Thursday and from 9:00 AM to 3:30 PM on Friday.
For social occasions, punctuality is relaxed and the proper protocol is being 30 minutes late.
Outside the business arena Colombians tend to be spontaneous rather than planners.