Format date and time as you like most

Problem. How do I make a string containing the current date and time with a format I like ?

Solution. Just follow this example. I use Printf package here because it lets me state I want in output an integer printed with 2 digits padding it with zeroes if necessary.

Feature require: 'Printf'

# make a DataAndTime object with the current date and time, then we print it the way we want
d0 _ DateAndTime now. 

# a very much standard date printing for e.g. a log file 
'myFile-%d-%02d-%02d-%02d-%02d.log' printf: {
                  d0 yearNumber.  d0 monthIndex.   d0 dayOfMonth. d0 hour24. d0 minute }
" 'myFile-2021-09-06-10-04.log' "

# a more personal date format, fit for human eyes
'%s-%02d-%s-%d-%02d:%02d' printf: {
                  d0 dayOfWeekAbbreviation. d0 dayOfMonth.  d0 monthAbbreviation .   
                  d0 yearNumber . d0 hour24. d0 minute }
"=>  'Mon-06-Sep-2021-10:04' "

Exercise. In the second example put the full month name, use the Browser to discover the proper message name.

Exercise. Get in output the current time in 12h format, that e.g. '10:00 AM'.

Exercise. Try to use String>>format: instead of String:printf: and see what happens.