The Geeky Linux :: Ubuntu/Linux blog :: Open source Tips and Tricks :: Linux Howtos and Tutorials

First day of Last Month = echo $(date --date "-1 month" +%Y-%m-01)
Last day of Last Month = echo $(date --date "-`date +%d` days -0 month" +%Y-%m-%d)

First day of Current Month = echo $(date --date "-0 month" +%Y-%m-01)
Last day of Current Month = echo $(date --date "-`date +%d` days +1 month" +%Y-%m-%d)

First day of Next Month = echo $(date --date "+1 month" +%Y-%m-01)
Last day of Next Month = echo $(date --date "-`date +%d` days +2 month" +%Y-%m-%d)