Develop Reference

Javascript Timestamp Conversion

the problem is as follows:
The file that i receive has a timestamp like
06/10/2016 02:58 AM
06/10/2016 05:20 PM
etc.
I'm using pentaho/kettle to eventually put this into a mysql database, the problem is that mysql only accepts yyyy-mm-dd hh-mm-ss timestamps. I'm not that great(if at all) in JavaScript and Kettle only support javascript, sadly.
I got it all split up, so it has a column called, 'days','months,'years', etc.
How can I make it so that if column Am/pm has "pm" in it, that it add 12 to the 'hours' column?
Or is there an easier way to do this in Kettle?
EDIT:
as i receive the csv i have 5 columns
1. Timestamp 2. Mobil_origin 3. mobile_Dest. 4.Call_cit 5.Call_dur
I want it so that all the timestamps get 'corrected' to the yyyy-mm-dd hh-mm-ss format.
so instead of 06/10/2016 05:20 PM it has to show 2016-10-06 17:20:00
It's the only thing that needs to happen actually, the rest of the file is good as is to be exported to mysql.

Bootstrap datepicker setStartDate not working properly?

I am using Bootstrap datepicker and on selecting different values from a list its startdate is changing. It is working fine if I set the startdate 2013 from 2008 but it doesn't work if a select start date 2008 and currently its 2013.
What could be the reason here?
$('#datepicker').datepicker('setStartDate', updatedDate);
This line I am executing whenever I select different startDate.

Really need to know what updatedDate value is.
However, if you read the docs for the dtepicker the value passed in must be a string that is understandable by format
https://bootstrap-datepicker.readthedocs.io/en/latest/methods.html#setstartdate
https://bootstrap-datepicker.readthedocs.io/en/latest/options.html#startdate
Date or String. Default: Beginning of time
The earliest date that may be selected; all earlier dates will be
disabled.
Date should be in local timezone. String must be parsable with format.
So what you pass in as the format option must match the format of your start date. If you do not set the format optin, the default is "mm/dd/yyyy"

Without seeing code, I can only hypothesize; try calling [...].datepicker('update', 'date_string'); on the object to force an update on the control.

fullcalendar confusion with UTC and local date

I do let fullcalendar initialize normally. So it represents current date. (Midnight->midnight, 1day, 1h slots)
From some other datasource I get data with timestamps. The format is "YYYY-MM-DD HH:mm" (transmitted as a string, no timezone information)
So I convert that string to a moment object and test against fullcalendar.start and .end to see if it is within.
moment("2016-04-07 00:00") == $('#calendar').fullCalendar('getView').end
This results in false though the following command
$('#calendar').fullCalendar('getView').end.format("YYYY-MM-DD HH:mm")
returns
"2016-04-07 00:00"
I also tried to compare with diff
moment("2016-04-07 00:00").diff( $('#calendar').fullCalendar('getView').end,"minutes")
which returns
120
Some research on the calendars.end object in Chrome Dev Tools revealed that it internally is represented as
2016-04-07 02:00 GMT+0200
This looks strange to me. I am in timezone 2h ahead of GMT. So it should correctly say 2016-04-07 00:00 GMT+0200, should it not?
This also explains why the diff test above resulted in 120 minutes.
Can someone help? I do not get where the conversion problem comes from. I am using only dates with no timezone information. And as said above, fullcalendar initalizes with no gotodate information and shows a time bar from 00:00 to 00:00. So why does it come that there is this 2h difference?

Thanks a lot. I do understand things a lot better now.
Some of the dates I tried to compare were 'now'. I got 'now' by
var n = moment()
That turned out to be a date time including my timezone.
E.g. moment().format() resulted in '2016-04-07 00:00 GMT+0200' and I now see how this went wrong excepting a comparison against full calendar.end to be true but it was false as '2016-04-07 00:00 GMT+0200' is '2016-04-06 22:00' at UTC.
As
moment.utc()
does not work, I know ended up with using
moment.utc(moment().format('YYYY-MM-DD HH:mm'))
This now seems to work as this treats my local time as it would be the 'numerical same time' at UTC.. thus matching with how fullcalendar handles times internally (ambiguously-zones moments).
Thanks

A few things:
The timezone parameter controls how FullCalendar works with time zones.
By default, FullCalendar uses "ambiguously-zoned moments". These are customizations to moment.js made within fullCalendar. The docs state:
The moment object has also been extended to represent a date with no specified timezone. Under the hood, these moments are represented in UTC-mode.
Thus, to compare dates in this mode, treat them as if they were in UTC.
moment.utc("2016-04-07 00:00")
To compare moments, use the moment query functions, isSame, isBefore, isAfter, isSameOrBefore, isSameOrAfter, and isBetween.
In this case, since FullCalendar's start is inclusive but the end date is exclusive, you probably want to compare like this:
var cal = $('#calendar').fullCalendar('getView');
var start = cal.start;
var end = cal.end;
var m = moment.utc("2016-04-07 00:00"); // your input
var between = m.isSameOrAfter(start) && m.isBefore(end);
Note that there's an pending enhancement to moment's isBetween functionality for a future release that will give you control of exclusivity, but currently isBetween is fully inclusive, so you have to use the combination of functions shown here.

Using Moment.js like PHP's date and strtotime

I'm a typically server side developer feeling a bit like a fish out of water trying to display time values on the front end. How can I get behavior like PHP's date() and strtotime() functions out of moment.js? I just want a unix timestamp to appear in H:i:s format, and vice versa.
So far I've tried the following, from existing example code and the documentation:
moment(timestamp).format(H:i:s);
moment().duration(timestamp).format(H:i:s);
moment.unix(timestamp).format(h:mm:ss);
moment(formatted,'H:i:s');
Not a SINGLE one of which has worked properly. This may get flagged as duplicate since there are plenty of moment.js questions out there, but I don't know whether it's been updates to the library itself or slightly different context, I have not found one existing solution that has worked for me.
Anybody have any suggestions for these two simple tasks?
EDIT:
I've distilled two different problems out of this. One is that functions the moment docs say should work are giving weird values:
moment(1437462000).format('h:mm:ss')
for instance, which should return 7:00:00 utc, returns 10:17:42. This can be fixed in this case by using moment.unix(1437462000).utc().format('h:mm:ss') instead, but this leads into the second problem - the .utc() function seems to get ignored when converting back from a date into a timestamp:
timestamp = moment(formatted,'DD/MM/YYYY H:m:s').utc().unix();
will still return a timezone corrected value (in my case this is incorrect by several hours since the formatted time in question has nothing to do with the client computer) regardless of whether the .utc() function is included or not.

A few things you should realize:
Unix timestamps should always in terms of UTC. They are never adjusted for time zone in numerical form. If they're adjusted for time zone, that's done during the interpretation of the number, not in its representation.
While traditionally a "Unix Timestamp" is in terms of seconds, many environments use milliseconds instead. PHP's date timestamps are based on seconds, while moment and JavaScript's Date object both use milliseconds by default. Using the moment.unix function will let you pass seconds, and is identical to just multiplying the timestamp by 1000.
Moment has two built-in modes, local and UTC. The default mode is local. It doesn't matter what input you provide, if you don't specify UTC, the moment is adjusted to local. To specify UTC, you use the utc function. There are two forms of the function:
moment.utc(input) // parsing form
moment(input).utc() // conversion form
Both forms take some input and result in a moment in UTC mode. The difference is in how the input is interpreted. In either case, if the input value is unambiguous, the result is the same. For strings, that means the input would contain either a Z (from ISO8601), or a UTC-based offset. All other forms are ambiguous. For example, if I pass "2015-11-08 01:23:45", I will get different results depending on whether I interpret that string as local time or as UTC.
For numbers, they are always interpreted as milliseconds in UTC. However, if you use moment(number) without then calling .utc() then the moment is left in local mode, so any output will display as local time.
When you call moment.unix(input), the input is a number of seconds, but the moment is left in local mode. So to display the UTC time, you would use moment.unix(input).utc().
If your pre-recorded timestamps from your other system are in numeric form, but have been adjusted away from UTC, then they are incorrect. You have bad data, and Moment can't help you unless you know specifically how they have deviated and you write code to counteract that.
Moment's formatters are case sensitive. M is months, m is minutes. H is hours on a 24-hour clock, h is hours on a 12-hour clock. Use two consecutive letters when you want to include zero-padding. Example, HH:mm:ss for 13:02:03 vs. h:m:s for 1:2:3.
Moment's X formatter does not care which mode the moment is in. It will always emit seconds in UTC. Likewise, the x formatter returns milliseconds in UTC, as does moment.valueOf().
Also, your last example:
moment.unix(1437462000).utc().format()
Returns "2015-07-21T07:00:00+00:00" - which I believe is the value you expected.
You also get the same original timestamp regardless of which of these you try:
moment.unix(1437462000).utc().format("X") // "1437462000"
moment.unix(1437462000).format("X") // "1437462000"
moment.unix(1437462000).utc().unix() // 1437462000
moment.unix(1437462000).unix() // 1437462000

For anyone who comes in and is still looking for direct PHP equivalents for date() and strtotime(), here are the ones I ended up using. Matching up to php basically means just completely ignoring any kind of local time information by making sure everything is in UTC. That task is a little different between the timestamp->date and date->timestamp cases, though, so you have to be careful.
date()
Converting a timestamp to formatted date without any client timezone correction
var formatted = moment.unix(timestamp).utc().format('h:mm:ss');
strtotime()
Converting a UTC formatted date back to a timestamp without correcting it to local time:
var new_timestamp = moment.utc(formatted_utc,'DD/MM/YYYY H:m:s').format('X')
//where 'DD/MM/YYYY H:m:s' is the formatted date's format, and
//'X' outputs a unix timestamp without milliseconds.
Notes:
Do not use moment() with parenthesis in the calls:
moment().utc(date,format) will return local time values, not your
input.
Moment.js does not like the use of 'i' for minutes in the formatting,
unlike php.

Bootstrap datetime picker picking day before selected

I am using this bootstrap datetime picker. I noticed that when I choose a day and convert the milliseconds using var d1 = new Date(milliseconds); it is converted into the day before my selected day. Is there a particular reason for this?
Example:
I select Tuesday, October 1st:
I log the date object after it is converted:

You must convert it into a Unix timestamp , which is a better way of tracking date/time.
Use new Date('your_date_string').getTime() / 1000 which gives you the timestamp or using PHP (strtotime) .
The date object that is being logged for you is probably coming from your system/browser settings(local).
Do not use JavaScript date and time calculations in web applications unless you ABSOLUTELY have to.
While you have the timestamp, cross-check if you are getting the correct time.