# Created on savesnippets.com · https://savesnippets.com/tMNlxQhLaCxp5E
# Tomorrow / yesterday
date -d "tomorrow" +%F             # 2025-03-13
date -d "yesterday" +%F            # 2025-03-11

# N units from now
date -d "+7 days" +%F              # one week from today
date -d "-2 weeks" +%F             # two weeks ago
date -d "+3 months" +%F            # three months from today

# From a specific date
date -d "2025-01-01 +30 days" +%F  # 2025-01-31

# Same with a Unix timestamp result
date -d "2025-01-01 +30 days" +%s

# macOS / BSD date — different syntax (uses -v)
date -v +7d +%F                    # 7 days from now
date -v -1m +%F                    # 1 month ago