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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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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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