Format Date Like a Pro

# Current time
date                               # Wed Mar 12 14:25:00 CDT 2025

# ISO 8601 / RFC 3339 (UTC)
date -u +"%Y-%m-%dT%H:%M:%SZ"       # 2025-03-12T19:25:00Z
date -u +"%FT%TZ"                  # same, shorter
date --iso-8601=seconds            # GNU shortcut

# Custom formats
date +"%A %B %d, %Y"               # Wednesday March 12, 2025
date +"%j"                         # day of year (071)
date +"%U"                         # week number (10)

# Format a specific date (GNU date)
date -d "next Friday" +%F          # 2025-03-14
date -d "2 weeks ago" +%F          # 2025-02-26
date -d @1735689600 +%F            # convert epoch → date