[Bash] Calendar and Dates

Calendar

cal
      May 2024        
Su Mo Tu We Th Fr Sa  
          1  2  3  4  
 5  6  7  8  9 10 11  
12 13 14 15 16 17 18  
19 20 21 22 23 24 25  
26 27 28 29 30 31     

# all months
cal 2024

# first 6 lines
cal 2024 | head -n 6

# show one month
cal aug 2024

# prevous, current, next months
cal -3

Date

$ date

Thu May 30 12:39:26 EEST 2024

# formats
$ date +'%H:%M:%S %Y-%m-%d'

12:40:45 2024-05-30

# %F for %Y-%m-%d
date +'%H:%M:%S %F'

# %T for %H:%M:%S
date +'%T %F'

Advance example

Create files by using data and format

echo hello there >> `date +'%F'`.txt