Convert a given date and time to UNIX Time Stamp

Programming Questions

Marco

Convert a given date and time to UNIX Time Stamp

in Programming Questions • 2 months ago

Hi! I want to convert this output to UNIX Time Stamp but unable to find out how... It´s the current system date with zero hours/minutes/seconds. Can someone help me with an example? Would be very appreciated! Best regards!

int day = day();
int month = month();
int year = year();
int hour = 0; //hour();
int minute = 0; //minute();
int second = 0; //second();
println(day+"/"+month+"/"+year);
println(hour+":"+minute+":"+second);

Replies(11)

cageehv

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

hi mjheleno,

import java.util.*;
Date d = new Date();
println(d.getTime());

should do the trick ;-)

Rolf

Marco

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

Hi cageehv,

Thanks for the reply/help.

I think this gives me the current system time in UNIX Time Stamp.

How can I feed in these variables (below), and get the UNIX Time Stamp for that?

Thanks for your help!

int day = day();
int month = month();
int year = year();
int hour = 0; //hour();
int minute = 0; //minute();
int second = 0; //second();
println(day+"/"+month+"/"+year);
println(hour+":"+minute+":"+second);

cageehv

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

You don't need the separate vars like day, month, year, etc.

The var d (Date d = new Date();)
has the system date with all these properties in it.

Rolf

Marco

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

Thanks once again!

But I want to zero out the hour/minutes/seconds so that I can get a UNIX Time Stamp for each beging of day. Sorry If I didn't explain my self or if there is something very easy that I am not seeing/getting...

kooogy

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

but rolf, s/he wants midnight, not the time now.

use Calendar. something like

Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
long unixTime = cal.getTime() / 1000; // milliseconds to seconds

cageehv

Re: Re: Convert a given date and time to UNIX Time Stamp

2 months ago

Yes, you are right kooogy! I overlooked that ;-)

Another simple way to do it (if you don't need midnight, but the actual time):
long epoch = System.currentTimeMillis()/1000;
println(epoch);

Marco

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

Hi Rolf and Kooogy.

I´m a He :D (Marco).

Thanks for the replies and all the help!

Yes, I want to feed an API the exact starting second of each day. So if I´m not wrong would be getting the system date and zero out the hour/min./sec.

Is this the right way to feed the exact starting second of each day in UNIX Time Stamp?

Also, Kooogy's example gives me an error in Processing. The output is in date format and Processing doesn't convert it into long. I even tried long unixTime = Long.parseLong (cal.getTime())/1000; but still no luck.

Any way to work around this? I would also very much apreciate if there is any way of doing this without having to import java.util.*. I am thinking of having both Java and Js versions in the future. If it's to much of a trouble, a link pointing to a explaining webpage will also be appreciated.

Thank you for both your time and consideration!

kooogy

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

sorry, hadn't realised getTime() returns a Date. (Date.getTime() gets a long!)

long unixTime = cal.getTimeInMillis() / 1000;

kooogy

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

(the other way, and i haven't investigated this, would be to get the system time in milliseconds and then take the integer part of that divided by the number of milliseconds in a day (24 * 60 * 60 * 1000) to give unixtime in days. then multiple that by 24 * 60 * 60 to get the unixtime in seconds. this is a guess. but easy enough to test - compare against Calendar version)

cageehv

Re: Re: Convert a given date and time to UNIX Time Stamp

2 months ago

Good point, kooogy!

So, this should do:

long epoch = 1000*(System.currentTimeMillis()/(24*60*60*1000));
println(epoch);

No java imports needed for this.

Marco

Re: Convert a given date and time to UNIX Time Stamp

2 months ago

Once again thank you both for your time and consideration!

After Kooogy's last reply a light bulb when on in my head :D and I got it!

This makes it work.

println( (System.currentTimeMillis() - (60*60*hour() + 60*minute() + second())*1000)/1000 );

I used this online converter to compare: http://www.4webhelp.net/us/timestamp.php?action=stamp&stamp=1376262000&timezone=1

Top Reply