Conky

Main one I use:
https://github.com/zagortenay333/conky-Vision

https://help.ubuntu.com/community/SettingUpConky

https://github.com/brndnmtthws/conky/blob/master/extras/convert.lua

https://wiki.archlinux.org/index.php/conky

https://mylinuxramblings.wordpress.com/2010/03/23/how-to-configure-the-conky-system-monitor/

https://ubuntuforums.org/showthread.php?t=281865&page=2306

https://github.com/mrmierzejewski/conkyrc

https://github.com/helmuthdu/conky_colors

TIME FORMAT IN SCRIPTS.

Complete list of FORMAT control characters supported by date command, eg 

FORMAT controls the output.It can be the combination of any one of the following:


%%    a literal %
%a    locale's abbreviated weekday name (e.g., Sun)
%A    locale's full weekday name (e.g., Sunday)
%b    locale's abbreviated month name (e.g., Jan)
%B    locale's full month name (e.g., January)
%c    locale's date and time (e.g., Thu Mar 3 23:05:25 2005)
%C    century; like %Y, except omit last two digits (e.g., 21)
%d    day of month (e.g, 01)
%D    date; same as %m/%d/%y
%e    day of month, space padded; same as %_d but no leading 0
%F    full date; same as %Y-%m-%d
%g    last two digits of year of ISO week number (see %G)
%G    year of ISO week number (see %V); normally useful only with %V
%h    same as %b
%H    hour (00..23)
%I    hour (01..12)
%j    day of year (001..366)
%k    hour ( 0..23)
%l    hour ( 1..12)
%m    month (01..12)
%M    minute (00..59)
%n    a newline
%N    nanoseconds (000000000..999999999)
%p    locale's equivalent of either AM or PM; blank if not known
%P    like %p, but lower case
%r    locale's 12-hour clock time (e.g., 11:11:04 PM)
%R    24-hour hour and minute; same as %H:%M
%s    seconds since 1970-01-01 00:00:00 UTC
%S    second (00..60)
%t    a tab
%T    time; same as %H:%M:%S
%u    day of week (1..7); 1 is Monday
%U    week number of year, with Sunday as first day of week (00..53)
%V    ISO week number, with Monday as first day of week (01..53)
%w    day of week (0..6); 0 is Sunday
%W    week number of year, with Monday as first day of week (00..53)
%x    locale's date representation (e.g., 12/31/99)
%X    locale's time representation (e.g., 23:13:48)
%y    last two digits of year (00..99)
%Y    year
%z    +hhmm numeric timezone (e.g., -0400)
%:z    +hh:mm numeric timezone (e.g., -04:00)
%::z    +hh:mm:ss numeric time zone (e.g., -04:00:00)

%:::z    numeric time zone with : to necessary precision (e.g., -04, +05:30)
%Z    alphabetic time zone abbreviation (e.g., EDT)