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Full Discussion: Increment date variable
Top Forums Shell Programming and Scripting Increment date variable Post 302911773 by Don Cragun on Sunday 3rd of August 2014 12:43:49 AM
Old 08-03-2014
Some people may suggest calling date twice, but if you do that just before and just after a change in the minute, the two values won't be related the way you want them. (As a close to worst case, that could give you values two hours and 1 minute apart instead of one hour apart.) Try something like:
Code:
#!/bin/ksh
read d h m <<-EOF
    $(date '+%F %H %M')
EOF
now="$d $h:$m:00"
next="$d $(printf '%02d:%02d:00' $((${h#0} + 1)) $m)"

This was tested using the Korn shell, but will work with any shell that performs POSIX standard shell command substitutions and parameter expansions (including bash and ksh, among others). To see that it works, you'll need to either trace what it is doing or print the results.

It won't work after 11pm, but that doesn't seem to be a problem for you requirements.
This User Gave Thanks to Don Cragun For This Post:
 

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DATETIME.FORMAT(3)							 1							DATETIME.FORMAT(3)

DateTime::format - Returns date formatted according to given format

       Object oriented style

SYNOPSIS
public string DateTime::format (string $format) DESCRIPTION
string DateTimeImmutable::format (string $format) string DateTimeInterface::format (string $format) Procedural style string date_format (DateTimeInterface $object, string $format) Returns date formatted according to given format. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3) o $format - Format accepted by date(3). RETURN VALUES
Returns the formatted date string on success or FALSE on failure. EXAMPLES
Example #1 DateTime.format(3) example Object oriented style <?php $date = new DateTime('2000-01-01'); echo $date->format('Y-m-d H:i:s'); ?> Procedural style <?php $date = date_create('2000-01-01'); echo date_format($date, 'Y-m-d H:i:s'); ?> The above example will output: 2000-01-01 00:00:00 NOTES
This method does not use locales. All output is in English. SEE ALSO
date(3). PHP Documentation Group DATETIME.FORMAT(3)
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