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Full Discussion: Compare date bash script
Top Forums UNIX for Beginners Questions & Answers Compare date bash script Post 303041980 by Neo on Tuesday 10th of December 2019 08:40:39 AM
Old 12-10-2019
Yeah, that is your "problem"

You store the date and time as a formatted datetime string.

This creates a mess.

It is best to store all your dates (as I said) as an integer(11) not a string but since you are storing as a datetime string, that's OK... you can deal with this easily:

The first thing you need to do is to convert that datetime string to a unix timestamp, for example (like this):

Code:
query="select UNIX_TIMESTAMP( 'YOUR DATETIME STRING HERE') FROM TemperatureLOG order by TimeLog DESC LIMIT 1;"

I did not test it, but you get the idea. UNIX_TIMESTAMP() will take a formatted string and convert it to unix time.


Quote:
MySQL UNIX_TIMESTAMP() returns a Unix timestamp in seconds since '1970-01-01 00:00:00' UTC as an unsigned integer if no arguments are passed with UNIX_TIMESTAMP().

When this function is used with a date argument, it returns the value of the argument as an unsigned integer in seconds since '1970-01-01 00:00:00' UTC.

The argument may be a DATE, DATETIME,TIMESTAMP or a number in YYYYMMDD or YYMMDD.

Note: Since UNIX_TIMESTAMP() works on the current datetime, your output may vary from the output shown.

Syntax:

UNIX_TIMESTAMP(); UNIX_TIMESTAMP(date); UNIX_TIMESTAMP(datetime);
 

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DateTime::Format::W3CDTF(3pm)				User Contributed Perl Documentation			     DateTime::Format::W3CDTF(3pm)

NAME
DateTime::Format::W3CDTF - Parse and format W3CDTF datetime strings SYNOPSIS
use DateTime::Format::W3CDTF; my $w3c = DateTime::Format::W3CDTF->new; my $dt = $w3c->parse_datetime( '2003-02-15T13:50:05-05:00' ); # 2003-02-15T13:50:05-05:00 $w3c->format_datetime($dt); DESCRIPTION
This module understands the W3CDTF date/time format, an ISO 8601 profile, defined at http://www.w3.org/TR/NOTE-datetime. This format as the native date format of RSS 1.0. It can be used to parse these formats in order to create the appropriate objects. METHODS
This API is currently experimental and may change in the future. o new() Returns a new W3CDTF parser object. o parse_datetime($string) Given a W3CDTF datetime string, this method will return a new "DateTime" object. If given an improperly formatted string, this method may die. o format_datetime($datetime) Given a "DateTime" object, this methods returns a W3CDTF datetime string. NOTE: As of version 0.4, format_datetime no longer attempts to truncate datetimes without a time component. This is due to the fact that "DateTime" doesn't distinguish between a date with no time component, and midnight. o format_date($datetime) Given a "DateTime" object, return a W3CDTF datetime string without the time component. SUPPORT
Support for this module is provided via the datetime@perl.org email list. See http://datetime.perl.org/?MailingList for details. Please submit bugs to the CPAN RT system at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=datetime-format-w3cdtf or via email at bug-datetime-format-w3cdtf@rt.cpan.org. AUTHOR
Dave Rolsky <autarch@urth.org> CREDITS
This module is maintained by Gregory Todd Williams <gwilliams@cpan.org>. It was originally created by Kellan Elliott-McCrea <kellan@protest.net>. This module was inspired by DateTime::Format::ICal COPYRIGHT
Copyright (c) 2009 David Rolsky. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Copyright (c) 2003 Kellan Elliott-McCrea Portions of the code in this distribution are derived from other works. Please see the CREDITS file for more details. The full text of the license can be found in the LICENSE file included with this module. SEE ALSO
datetime@perl.org mailing list http://datetime.perl.org/ perl v5.10.1 2011-02-06 DateTime::Format::W3CDTF(3pm)
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