date crap

How to get the current epoch time in …

Perl time
PHP time()
Ruby (or To display the epoch:
Python import time first, then time.time()
Java long epoch = System.currentTimeMillis()/1000;
Microsoft .NET C# epoch = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
VBScript/ASP DateDiff("s", "01/01/1970 00:00:00", Now())
Erlang calendar:datetime_to_gregorian_seconds(calendar:now_to_universal_time( now()))-719528*24*3600.
MySQL SELECT unix_timestamp(now()) More information
PostgreSQL SELECT extract(epoch FROM now());
Oracle PL/SQL SELECT (SYSDATE - TO_DATE('01-01-1970 00:00:00', 'DD-MM-YYYY HH24:MI:SS')) *
24 * 60 * 60 FROM DUAL
SQL Server SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE())
JavaScript Math.round(new Date().getTime()/1000.0) getTime() returns time in milliseconds.
Unix/Linux date +%s
PowerShell Get-Date -UFormat "%s" Produces: 1279152364.63599
Other OS’s Command line: perl -e "print time" (If Perl is installed on your system)

Convert from human readable date to epoch

Perl Use these Perl Epoch routines
PHP mktime(hour, minute, second, month, day, year) More information
Ruby Time.local(year, month, day, hour, minute, second, usec ) (or for GMT/UTC input). To display add .to_i
Python import time first, then int(time.mktime(time.strptime('2000-01-01 12:34:00', '%Y-%m-%d %H:%M:%S'))) - time.timezone
Java long epoch = new java.text.SimpleDateFormat ("dd/MM/yyyy HH:mm:ss").parse("01/01/1970 01:00:00");
VBScript/ASP DateDiff("s", "01/01/1970 00:00:00", time field) More information
MySQL SELECT unix_timestamp(time) Time format: YYYY-MM-DD HH:MM:SS or YYMMDD or YYYYMMDD
More on using Epoch timestamps with MySQL
PostgreSQL SELECT extract(epoch FROM date('2000-01-01 12:34'));
With timestamp: SELECT EXTRACT(EPOCH FROM TIMESTAMP WITH TIME ZONE '2001-02-16 20:38:40-08');
With interval: SELECT EXTRACT(EPOCH FROM INTERVAL '5 days 3 hours');
SQL Server SELECT DATEDIFF(s, '1970-01-01 00:00:00', time field)
JavaScript use the JavaScript Date object
Unix/Linux date +%s -d"Jan 1, 1980 00:00:01" Replace ‘-d’ with ‘-ud’ to input in GMT/UTC time.

Convert from epoch to human readable date

Perl Use these Perl Epoch routines
PHP date(output format, epoch); Output format example: ‘r’ = RFC 2822 date More information
Python import time first, then time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.localtime(epoch)) Replace time.localtime with time.gmtime for GMT time. More information
Java String date = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new java.util.Date (epoch*1000));
VBScript/ASP DateAdd("s", epoch, "01/01/1970 00:00:00") More information
MySQL from_unixtime(epoch, optional output format) The default output format is YYY-MM-DD HH:MM:SS more …
PostgreSQL PostgreSQL version 8.1 and higher: SELECT to_timestamp(epoch); More information Older versions: SELECT TIMESTAMP WITH TIME ZONE 'epoch' + epoch * INTERVAL '1 second';
SQL Server DATEADD(s, epoch, '1970-01-01 00:00:00')
Microsoft Excel =(A1 / 86400) + 25569 Format the result cell for date/time, the result will be in GMT time (A1 is the cell with the epoch number). For other timezones: =((A1 +/- timezone adjustment) / 86400) + 25569.
Crystal Reports DateAdd("s", {EpochTimeStampField}-14400, #1/1/1970 00:00:00#) -14400 used for Eastern Standard Time. See Timezones.
JavaScript use the JavaScript Date object
Unix/Linux date -d @1190000000 Replace 1190000000 with your epoch, needs recent version of ‘date’. Replace ‘-d’ with ‘-ud’ for GMT/UTC time.
PowerShell Function get-epochDate ($epochDate) { [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($epochDate)) }, then use: get-epochDate 1279152364. Works for Windows PowerShell v1 and v2
Other OS’s Command line: perl -e "print scalar(localtime(epoch))" (If Perl is installed) Replace ‘localtime’ with ‘gmtime’ for GMT/UTC time.

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