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Top Forums UNIX for Beginners Questions & Answers How bash treats literal date value and retrieve year, month and date? Post 302991552 by Corona688 on Monday 13th of February 2017 10:58:40 AM
Old 02-13-2017
This isn't being done by BASH, everything here is being done by date - GNU date specifically. Basic POSIX date doesn't have "+ 3 days" (but in my opinion, should.)


GNU date - and most of the civilized world sincd 1988 - understand dates in the ISO standard YYYY/MM/DD form. This method has pretty clear advantages like dates being trivially sortable. So you could do -d "2016/12/31 + 3 days", etc.

Last edited by Corona688; 02-13-2017 at 12:14 PM..
 

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DP(8)                                                                [nmh-1.5]                                                               DP(8)

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}))%> which says that if an error was detected, print the error, a `:', and the date in error. Otherwise, output the 822-proper format of the 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)
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