04-17-2002
format date/time presentation
1) i am trying to print the timeframe of a log file using the start/end date/time being extracted from the file itself. my problem is how to convert the following numeric date format to the one that i prefer:
Start time: 0204161129
End time : 0204171431
into:
Start time: Apr 16 2002 11:29 AM
End time : Apr 17 2002 14:31 PM
I have a script that is working, but with a horrible 40+ lines into it, and i wanted to, at least, improve it.
2) also, for the "man date" description below, how can i get all those variables, and the value they represent? is there a command # date '+....' for a variable to specify AM or PM on the date/time? i think this will be a very good info too.
thanks a lot!
==============================================
DESCRIPTION
The date utility writes the date and time to standard output
or attempts to set the system date and time. By default,
the current date and time will be written.
Specifications of native language translations of month and
weekday names are supported. The month and weekday names
used for a language are based on the locale specified by the
environment variable LC_TIME; see environ(5).
The following is the default form for the "C" locale:
%a %b %e %T %Z %Y
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NAME
dp - parse dates 822-style
SYNOPSIS
/usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...
DESCRIPTION
Dp is a program that parses dates according to the ARPA Internet standard. It also understands many non-standard formats, such as those
produced by TOPS-20 sites and some UNIX sites using ctime(3). It is useful for seeing how nmh will interpret a date.
The dp program treats each argument as a single date, and prints the date out in the official 822-format. Hence, it is usually best to
enclose each argument in quotes for the shell.
To override the output format used by dp, the -format string or -format file switches are used. This permits individual fields of the
address to be extracted with ease. The string is simply a format string and the file is simply a format file. See mh-format(5) for the
details.
Here is the default format string used by dp:
%<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>
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date.
FILES
$HOME/.mh_profile The user profile
PROFILE COMPONENTS
None
SEE ALSO
ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)
DEFAULTS
`-format' default as described above
`-width' default to the width of the terminal
CONTEXT
None
BUGS
The argument to the -format switch must be interpreted as a single token by the shell that invokes dp. Therefore, one must usually place
the argument to this switch inside quotes.
MH.6.8 11 June 2012 DP(8)