What is epoch time?

The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (in ISO 8601: 1970-01-01T00:00:00Z). Literally speaking the epoch is Unix time 0 (midnight 1/1/1970), but ‘epoch’ is often used as a synonym for ‘Unix time’. Many Unix systems store epoch dates as a signed 32-bit integer, which might cause problems on January 19, 2038 (known as the Year 2038 problem or Y2038).

How to get the current epoch time in …

Convert from human readable date to epoch

Perl	Use the Perl Epoch routines
PHP	mktime(hour, minute, second, month, day, year)
Ruby	Time.local(year, month, day, hour, minute, second, usec ) (or Time.gm 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 (“MM/dd/yyyy HH:mm:ss”).parse(“01/01/1970 01:00:00”).getTime();
VBScript/ASP	DateDiff(“s”, “01/01/1970 00:00:00”, time field)
C	Use the C Epoch Converter routines
R	as.numeric(as.POSIXct(“MM/dd/yyyy HH:mm:ss”, origin=”1970-01-01″))
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 Shell	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 the Perl Epoch routines
PHP	date(output format, epoch); Output format example: ‘r’ = RFC 2822 date
Ruby	Time.at(epoch)
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.
Java	String date = new java.text.SimpleDateFormat(“MM/dd/yyyy HH:mm:ss”).format(new java.util.Date (epoch*1000));
VBScript/ASP	DateAdd(“s”, epoch, “01/01/1970 00:00:00”)
C	Use the C Epoch Converter routines
R	as.POSIXct(epoch, origin=”1970-01-01″)
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); Older versions: SELECT TIMESTAMP WITH TIME ZONE ‘epoch’ + epoch * INTERVAL ‘1 second’;
Oracle PL/SQL	SELECT to_date(’01-JAN-1970′,’dd-mon-yyyy’)+(1326357743/60/60/24) from dual Replace 1326357743 with epoch.
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 time zones: =((A1 +/- time zone adjustment) / 86400) + 25569.
Crystal Reports	DateAdd(“s”, {EpochTimeStampField}-14400, #1/1/1970 00:00:00#) -14400 used for Eastern Standard Time. See Time Zones.
JavaScript	Use the JavaScript Date object
Tcl/Tk	clock format 1325376000
Unix/Linux Shell	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.

Reference

http://www.epochconverter.com/

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Several tasks take arguments that will be passed to another process on the command line. To make it easier to specify arguments that contain space characters, nested arg elements can be used.

value – a single command-line argument; can contain space characters.

file – The name of a file as a single command-line argument; will be replaced with the absolute filename of the file.

path – A string that will be treated as a path-like string as a single command-line argument; you can use ; or : as path separators and Ant will convert it to the platform’s local conventions.

pathref – Reference to a path defined elsewhere. Ant will convert it to the platform’s local conventions.

line – a space-delimited list of command-line arguments.

It is highly recommended to avoid the line version when possible. Ant will try to split the command line in a way similar to what a (Unix) shell would do, but may create something that is very different from what you expect under some circumstances.

Examples

<arg value=”-l -a”/>

is a single command-line argument containing a space character.

<arg line=”-l -a”/>

represents two separate command-line arguments.

<arg path=”/dir;/dir2:\dir3″/>

is a single command-line argument with the value \dir;\dir2;\dir3 on DOS-based systems and /dir:/dir2:/dir3 on Unix-like systems.

Command-line Options Summary
ant [options] [target [target2 [target3] …]]

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