Manipulate dates with linux

Current formatted date
date +%d-%m-%Y

Current formatted date with time
date '+%d-%m-%Y %H:%M:%S'

1 day before the current date
date -d '-1 day' +%d-%m-%Y

1 day after the current date
date -d '+1 day' +%d-%m-%Y

First day of current month
date -d '-0 month' +01-%m-%Y

Last day of current month
date -d "-$(date +%d) days +1 month" +%d-%m-%Y

Last day of current month + one day
date -d "-$(date +%d) days +1 month +1 day" +%d-%m-%Y

First day of the previous month
date -d '-1 month' +01-%m-%Y

Last day of the previous month
date -d "-$(date +%d) days -0 month" +%d-%m-%Y

First day of the next month
date -d '+1 month' +01-%m-%Y

Last day of the next month
date -d "-$(date +%d) days +2 month" +%d-%m-%Y

Date format style /var/log/messages ( Aug 25 19:15:20 )
date '+%b %d %R:%S'