convert a Unix timestamp to DateTime

Question

How can I convert a Unix timestamp to DateTime?

Dimitris Soulovaris · Accepted Answer

Since a Unix timestamp is the number of seconds from 01/01/1970 till now, you can try something like this: 
 (1651670870 / 86400) + datetime(1970, 01, 01, 00, 00)

Mike Schmitt · Answer

I was going to suggest the intervalds() function, but upon testing it appears to not like large values for seconds . 
 That said, the seconds() function appears to work here, too, if it helps anyone simplify things slightly. 
 datetime(1970, 1, 1, 00, 00) + second() * 1651670870 
 
 Edit to add: I never realized there's an addSeconds() function too. Maybe it's newer? (edit: it's from a plug-in, thanks Richard) 
 addseconds(datetime(1970, 1, 1, 00, 00), 1651670870)

Richard Michaelis · Answer

Use the following plugin: https://community.appian.com/b/appmarket/posts/date-and-time-utilities It has two new functions: 
 
 toUnixTimestamp - Returns the Unix timestamp from datetime 
 fromUnixTimestamp - Returns a Date and Time value by converting a Unix timestamp.

Richard Michaelis · Answer

Hello Ernesto, sounds stupid but you caculate it Unix time is basically a time difference. This count starts at the Unix Epoch on January 1st, 1970 at UTC 
 We are around at unix timestamp of 1651674100 currently So 1651674100/3600 = is the amount of hours A Years is 1651674100/ 31556926 is the amount of years https://www.unixtimestamp.com/ perhaps somebody has a suitable formula available. but basically you calculate what your number means as time difference

Dave Lewis · Answer

Lets see if we can work out the math ourselves. 
 So unix timestamp is seconds since 1970. Appian timestamp is DAYS since 2035 (so it's actually a negative number that keeps diminishing for now). 
 Perhaps what you do is convert seconds to days, so Unix timestamp / ( 3600 times 24). That gives you days since 1970 and Appian has days since 2035. Simple addition or subtraction should get you from there. 
 You can do lots of things to calculate it. One time, I said, "Duh, 525600 minutes!", and my friend sitting next to me said, "Did you just use the RENT method?" I did. I remembered that song from RENT (don't watch if you can avoid).

convert a Unix timestamp to DateTime

How can I convert a Unix timestamp to DateTime?

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