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Top Forums UNIX for Dummies Questions & Answers Date format from Jan 01 2015 11:00:00 PM to 01/01/2015 23.00.00 Post 302943597 by Don Cragun on Monday 11th of May 2015 03:29:06 AM
Old 05-11-2015
Is this a homework assignment?

What have you tried to solve this problem?

Do these date and time stamps appear on lines by themselves? Or at the start of lines? Or at a fixed location other than the start of a line? If not, how can the date and time stamps be uniquely identified as distinct from other text that might appear in your data?

Is this data contained in a text file? What is the format of data in your input file other than the date and time strings?

Is this a stand-alone project, or is other processing going to be done to your data at the same time? If other processing is being done, what tools are being used to do the other processing?

Your sample data and the format you showed us for your sample data is inconsistent. Is there one space between the day and the year as shown in:
Code:
Mon DD YYYY hh:mi:ss AM/PM

Or are there two spaces as shown in:
Code:
Jan 01  2015 11:00:00 PM

?
 

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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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