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date time to number and back in xbasic

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  • date time to number and back in xbasic


    In Javacript I can use the following function to get a numeric value of the current datetime

    var d = new Date();
    var rdatetime = d.getTime();

    I now have this value in a field in table and I want to process it in Xbasic back to a readable datetime string.

    In javascript I would do the following

    var dn = Date(rdatetime);

    I can't seem to find the equivalent function in xbasic.

    What am I missing?


  • #2
    Re: date time to number and back in xbasic

    i am not sure there is any function like that in alpha.
    the javascript epoch is 01/01/1970, the alpha julian date jdate and jtodate epoch runs further back and yields only date number.
    you may have to write your own function or if you can use jdate in alpha itself then
    assign date value to store that and convert back to human readable format using jtodate function.
    thanks for reading


    version 11 3381 - 4096
    mysql backend
    [email protected]
    Skype:[email protected]
    1 914 924 5171


    • #3
      Re: date time to number and back in xbasic

      here is a function that you can play with and see if it works out for you:
      FUNCTION alphaEpoch AS D(dNumber as N)
      dim jday as n
      jday = dNumber/(24*60*60*1000)
      alphaEpoch = jtodate(2440588+jday)
      now pass that number to this function and see if it converts properly.
      thanks for reading


      version 11 3381 - 4096
      mysql backend
      [email protected]
      Skype:[email protected]
      1 914 924 5171


      • #4
        Re: date time to number and back in xbasic

        You really just to change your milliseconds to seconds and add that to 1970. Remember that .getTime() uses UTC, so you can use the XBasic function getTimeZoneOffset() to get the number of hours difference and adjust your calculation by it.


        var d = new Date();
        var rdateTime = d.getTime();
        nbrSeconds = rdateTime / 1000.0;
        nbrSeconds = parseInt(nbrSeconds);


        function convertSeconds as c (e as p)


        dim startDate as t
        dim endDate as t
        dim nbrSeconds as n = val(e.nbrSeconds)
        startDate = ctodt("01/01/1970 00:00:00 am")

        dim utcDiff as n
        utcDiff = gettimezoneoffset()
        utcDiff = utcDiff*60*60

        nbrSeconds = nbrSeconds + utcDiff

        endDate = startDate + nbrSeconds

        end function

        I'd bet there's an XBasic function to do this... but... it's simple enough.
        Last edited by Davidk; 11-21-2016, 10:27 PM.


        • #5
          Re: date time to number and back in xbasic

          Hi David / Gandhi

          These are both good suggestions and both were areas I was looking at. I need the time portion of the date so David what your proposing works best. I had been passing date time as a string from android phones via a text file to xbasic, but depending on how the user was setting the format for date on the phone I was getting different formats. Now I can just pass through this numeric string .....although I do have to pass in the correct timezone offset from the phone or I'll end up with the Server offset.



          • #6
            Re: date time to number and back in xbasic

            Right... nice that it's the same function name... coincidence??? I think not...



            • #7
              Re: date time to number and back in xbasic

              Hi. Does anyone know how to create an Epoch timestamp in milliseconds? I'm using time_to_unixtimestamp(now()) but it's not giving me what I'm looking for.
              David Brown


              • #8
                Re: date time to number and back in xbasic

                I knew I'd seen that before... no idea what it's name was... could not find it again.

                Is doing the math for milliseconds not giving you what you need?


                • #9
                  Re: date time to number and back in xbasic

                  as it turns out there is a function
                  unixtimestamp_to_time function
                  you can just pass that number to that function.
                  you may take a look and see if that fits your need.
                  thanks for reading


                  version 11 3381 - 4096
                  mysql backend
                  [email protected]
                  Skype:[email protected]
                  1 914 924 5171


                  • #10
                    Re: date time to number and back in xbasic

                    thanks for the replys. The solution for what I need is time_to_unixtimestamp(now(.t.)).
                    David Brown


                    • #11
                      Re: date time to number and back in xbasic

                      So you wanted UTC Epoch time in seconds. That's a nice simple solution... thanks for posting.