Simple date calculation using date command

Jan 212011

Answer:

Date command is useful to calculate date, e.g. Assume today is 2011-01-15

1. Find a date in the past, e.g. 60 days ago

# date --date='60 days ago' "+%Y-%m-%d"
2010-11-16

2. Find a date in the future, e.g. 60 days in the future

# date --date='60 days' "+%Y-%m-%d"
2011-03-16