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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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ost::Date(3)						     Library Functions Manual						      ost::Date(3)

NAME
ost::Date - The Date class uses a julian date representation of the current year, month, and day. SYNOPSIS
#include <numbers.h> Inherited by ost::DateNumber, and ost::Datetime. Public Member Functions Date (time_t tm) Date (tm *dt) Date (char *str, size_t size=0) Date (int year, unsigned month, unsigned day) Date () virtual ~Date () int getYear (void) const unsigned getMonth (void) const unsigned getDay (void) const unsigned getDayOfWeek (void) const char * getDate (char *buffer) const time_t getDate (void) const time_t getDate (tm *buf) const long getValue (void) const void setDate (const char *str, size_t size=0) bool isValid (void) const operator long () const String operator() () const Date & operator++ () Date & operator-- () Date & operator+= (const long val) Date & operator-= (const long val) int operator== (const Date &date) int operator!= (const Date &date) int operator< (const Date &date) int operator<= (const Date &date) int operator> (const Date &date) int operator>= (const Date &date) bool operator! () const Protected Member Functions void toJulian (long year, long month, long day) void fromJulian (char *buf) const virtual void update (void) A method to use to 'post' any changed values when shadowing a mixed object class. Protected Attributes long julian Friends Date operator+ (const Date &date, const long val) Date operator- (const Date &date, const long val) Date operator+ (const long val, const Date &date) Date operator- (const long val, const Date &date) Detailed Description The Date class uses a julian date representation of the current year, month, and day. This is then manipulated in several forms and may be exported as needed. Author: David Sugar dyfet@ostel.com julian number based date class. Constructor &; Destructor Documentation ost::Date::Date (time_ttm) ost::Date::Date (tm *dt) ost::Date::Date (char *str, size_tsize = 0) ost::Date::Date (intyear, unsignedmonth, unsignedday) ost::Date::Date () virtual ost::Date::~Date () [virtual] Member Function Documentation void ost::Date::fromJulian (char *buf) const [protected] char* ost::Date::getDate (char *buffer) const time_t ost::Date::getDate (void) const time_t ost::Date::getDate (tm *buf) const unsigned ost::Date::getDay (void) const unsigned ost::Date::getDayOfWeek (void) const unsigned ost::Date::getMonth (void) const long ost::Date::getValue (void) const int ost::Date::getYear (void) const bool ost::Date::isValid (void) const Reimplemented in ost::Datetime. ost::Date::operator long () const [inline] bool ost::Date::operator! (void) const [inline] Reimplemented in ost::Datetime. int ost::Date::operator!= (const Date &date) String ost::Date::operator() () const Date& ost::Date::operator++ () Date& ost::Date::operator+= (const longval) Date& ost::Date::operator-- () Date& ost::Date::operator-= (const longval) int ost::Date::operator< (const Date &date) int ost::Date::operator<= (const Date &date) int ost::Date::operator== (const Date &date) int ost::Date::operator> (const Date &date) int ost::Date::operator>= (const Date &date) void ost::Date::setDate (const char *str, size_tsize = 0) void ost::Date::toJulian (longyear, longmonth, longday) [protected] virtual void ost::Date::update (void) [protected], [virtual] A method to use to 'post' any changed values when shadowing a mixed object class. This is used by DateNumber. Reimplemented in ost::DateNumber. Friends And Related Function Documentation Date operator+ (const Date &date, const longval) [friend] Date operator+ (const longval, const Date &date) [friend] Date operator- (const Date &date, const longval) [friend] Date operator- (const longval, const Date &date) [friend] Member Data Documentation long ost::Date::julian [protected] Author Generated automatically by Doxygen for GNU CommonC++ from the source code. GNU CommonC++ Sat Jun 23 2012 ost::Date(3)
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