date

# print the name of the weekday
date '+%a' #short version
date '+%A' #long version

# unix timestamp
date -u '+%s'

# see time in different timezone
TZ='Asia/Qatar' date

# print date in a simple format
date "+%b %d (%a)"

# print time alone
date "+%I:%M%p"

# print a usable filename with date and time
date '+%4Y%m%d_%s' or date  '+%4Y%m%d_%H%M%S'

# print todays date
date '+%Y-%m-%d'

# last date of month
date -d "-$(date +%d) days  month" +%Y-%m-%d

# first three characters of month name
date '+%b'

# date as number without separators
date +%Y%m%d

# date arithmetic
# Get the date n number of days into the future
date --date '+10 days'

# 2023_08_03
date "+%Y_%m_%d"

# Saturday, Nov 11
date "+%A, %b %d"

# for 24 h time
date '+%H:%M'