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Operating Systems Solaris Convert GMT date and time to CST Post 302996507 by Don Cragun on Thursday 27th of April 2017 01:33:57 AM
Old 04-27-2017
With a recent version of ksh (on a system that doesn't have a GNU date utility) in a terminal session where the default timezone is the US Pacific timezone, the following:
Code:
Date_GMT=042720170740
TZ=CST6CDT printf '%(%m%d%Y%H%M)T\n' "${Date_GMT:0:8} ${Date_GMT:8:2}:${Date_GMT:10} GMT"

produces the output:
Code:
042720170240

So, with a GNU date utility on a Linux system using a recent bash, the following might work:
Code:
Date_GMT=042720170740
TZ=CST6CDT date -d "${Date_GMT:0:8} ${Date_GMT:8:2}:${Date_GMT:10} GMT" '%m%d%Y%H%M'

If the timezone being used in your terminal session is already set to use US Central time zone, you can drop the TZ=CST6CDT at the start of the date command line.

PS: Note that a timestamp of 0740 GMT will NOT convert to a timestamp of 10:30:00 CST; with the given date, it would either convert to 2017-04-27 01:40:00 CST or, if you aren't in the parts of Indiana that don't observe daylight saving time, 2017-04-27 02:40:00 CDT. Getting this date format would need the date format string:
Code:
'%Y-%m-%d %H:%M:%S %Z'

instead of:
Code:
'%m%d%Y%H%M'


Last edited by Don Cragun; 04-27-2017 at 02:51 AM.. Reason: Fix date utility format string and add PS.
 

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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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