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Full Discussion: General Purpose Date Script
Top Forums UNIX for Beginners Questions & Answers General Purpose Date Script Post 302868049 by Corona688 on Friday 25th of October 2013 05:33:57 PM
Old 10-25-2013
Bug noted, thank you a lot, I had --date "something" when I should have done --date="something".

Thanks for reminding me about the +syntax feature, which I'd planned but forgotten.

Date math is not hard here, I am letting mktime handle absolutely everything tricky. I do not need to know when the next leap year is, I subtract 1 from the 'year' value and let mktime decide what that is.

Yes yes I know that Perl has about 37 different date modules I could be using. But if I'm going to tell someone to install 'Perl::MyFavoriteDateModule' I might as well just tell them to install GNU date. The whole point is to not do that, (and to show elegant Perl code is possible without including the kitchen sink).

Some of those tests are just weird though. I have no idea how you got 23 hours from subtracting days, it certainly doesn't happen here. I may have done something odd with a last-minute fix when I posted. [edit] Now I know. It happened because of the --date vs --date= problem. Perl does strange things when you do arithmetic on strings.

Anyway, I'll incorporate your suggestions and repost. Thanks again. [edit] Version 2 is now in the OP.

Last edited by Corona688; 10-25-2013 at 06:57 PM..
 

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sttime(3)						    ShapeTools Toolkit Library							 sttime(3)

NAME
stMktime, stWriteTime - date and time handling SYNOPSIS
#include <config.h> #include <sttk.h.h> time_tstMktime (char *string); char*stWriteTime (time_t date); DESCRIPTION
stMktime scans the given string and tries to read a date and time from it. It understands various formats of date strings. The following is a list of all valid formats, optional parts in brackets. [Tue] Jan 5[,] [19]93 This includes the standard asctime(3) format. Jan 5 With no year given, the year defaults to the current year. [19]93/01/05 This notation requires month and day represented by exactly two digits. 5.1.[19]93 This is the usual German notation. 5.1. German notation referencing the current year. A certain time, given together with the date must always have the following form. hours:minutes[:seconds] Each of the fields must be an integer value within the proper range (hours: 0-23, minutes and seconds: 0-59). Values below 10 may be written as one digit numbers. The time value may be placed anywhere in the date string: at the beginning, at the end, or somewhere in the middle. Any amount of white- space may be given between a field of the time value and the separating colon. The time is always considered to be local time. stWriteTime generates a time string similar to asctime(3) from its date argument. SEE ALSO
asctime(3) BUGS
Time Zone Names within the time string (like `MET') are not handled properly. In most cases they will cause a failure. sttk-1.7 Thu Jun 24 17:43:35 1993 sttime(3)
All times are GMT -4. The time now is 11:25 PM.
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