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Top Forums Shell Programming and Scripting Need Time Stamp Range On Log Files Post 302948721 by Don Cragun on Wednesday 1st of July 2015 05:20:33 PM
Old 07-01-2015
What operating system and shell are you using? (The tools available to process timestamps vary considerably from OS to OS, and in some cases from shell to shell.)

Are your log files sorted in increasing timestamp order?

Will the timestamp range you want to select ever cross day boundaries or will the start and end points always be on the same date?

Can you specify the timestamp format that the user has to enter for the start and end points (e.g., YYYYMMDDhhmmss, YYYYMMDD:hh:mm:ss, or DD/Mon/YYYY:hh:mm:ss)? If so, have you chosen a format, or can we select one that makes processing easier? If not, what format(s) do(es) your script need to be able to interpret?

Will all of the offsets from GMT (i.e., -0400) be the same for the timestamp ranges you're interested in? (Your script will be much more complex if log entries are coming from various timezones around the world or if your script has to make adjustments for timestamp ranges crossing shifts to and from daylight savings time.)

Is the output supposed to change at all (other than reducing the number of selected entires being processed)? If so, how?
 

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PX_TIMESTAMP2STRING(3)													    PX_TIMESTAMP2STRING(3)

px_timestamp2string - Converts the timestamp into a string.

SYNOPSIS
string px_timestamp2string (resource $pxdoc, float $value, string $format) DESCRIPTION
Turns a timestamp as it stored in the paradox file into human readable format. Paradox timestamps are the number of miliseconds since 0001-01-02. This function is just for convenience. It can be easily replaced by some math and the calendar functions as demonstrated in the following example. PARAMETERS
o $pxdoc - Resource identifier of the paradox database. o $value - Value as stored in paradox database field of type PX_FIELD_TIME, or PX_FIELD_TIMESTAMP. o $format - String format similar to the format used by date(3). The placeholders support by this function is a subset of those supported by date(3) (Y, y, m, n, d, j, H, h, G, g, i, s, A, a, L). RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Turn a paradox timestamp into a human readable form <?php $px = px_new(); /* make up a date as it could be stored in */ /* a date field of a paradox db. */ /* 700000 days since 1.1.0000. */ $days = 700000; /* Use the calendar functions to print a */ /* human readable format of the date */ echo jdtogregorian($days+1721425)." "; /* Turn it into a timestamp as it stored in a paradox database */ /* Timestamps are stored in miliseconds since 0001-01-02 */ $stamp = $days * 86400.0 * 1000.0; /* Add one hour */ $stamp += 3600000.0; /* The following will output '7/15/1917 01:00:00'. */ echo px_timestamp2string($px, $stamp, "n/d/Y H:i:s")." "; px_delete($px); ?> The above example will output: 7/15/1917 7/15/1917 01:00:00 The Julian day count as passed to jdtogregorian(3) has a different base of 1.1.4714 b.c. and must therefore be calculated by adding 1721425 to the day count used in the paradox file. Turning the day count into a timestamp is easily done by multiplying with 86400000.0 to obtain miliseconds. SEE ALSO
px_date2string(3), jdtogregorian(3). PHP Documentation Group PX_TIMESTAMP2STRING(3)
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