I'm importing data from csv to InfluxDB through a Django Rest Framework API endpoint.
The relevant part of the viewset:
if request.method == "PUT":
measurements = InputMeasurementSerializer(data=request.data, many=True)
measurements.is_valid(raise_exception=True)
The serializer:
class InputMeasurementSerializer(serializers.Serializer):
value = serializers.FloatField()
time = serializers.DateTimeField(input_formats=[
"%Y-%m-%d_%H:%M:%S", ...])
The input data is in the form of time value paires for every 15 minutes:
time,value
2021.04.11 00:00:00,0.172
2021.04.11 00:15:00,0.76
2021.04.11 00:30:00,0.678
2021.04.11 00:45:00,1.211
It works fine for all dates, except for the time values on the 28.03.2021 between 02:00-03:00 and on the 25.10.2020 between 02:00-03:00 it throws the exception: Invalid datetime for the timezone "Europe/Budapest".
Could be related to the time setting because of the daylight saving - but I don't see how exactly. Has anyone any clue what could be the problem here?
In my settings.py:
TIME_ZONE = 'Europe/Budapest'
USE_TZ = True
It indeed is because of the daylight savings, explained in the documentation
Even if your website is available in only one time zone, it’s still good practice to store data in UTC in your database. The main reason is Daylight Saving Time (DST). Many countries have a system of DST, where clocks are moved forward in spring and backward in autumn. If you’re working in local time, you’re likely to encounter errors twice a year, when the transitions happen. (The pytz documentation discusses these issues in greater detail.) This probably doesn’t matter for your blog, but it’s a problem if you over-bill or under-bill your customers by one hour, twice a year, every year. The solution to this problem is to use UTC in the code and use local time only when interacting with end users.
Related
my issue is that I want to be able to get two time stamps and compare if the second (later taken) one is less than 59 minutes away from the first one.
Following this thread Compare two dates with JavaScript
the date object may do the job.
but first thing i am not happy with is that it takes the time from my system.
is it possible to get the time from some public server or something?
cause there always is a chance that the system clock gets manipulated within the time stamps, so that would be too unreliable.
some outside source would be great.
then i am not too sure how to get the difference between 2 times (using 2 date objects).
many issue that may pop up:
time being something like 3:59 and 6:12
so just comparing minutes would give the wrong idea.
so we consider hours too.
biut there the issue with the modulo 24.
day 3 23:59 and day 4 0:33 wouldnt be viewed proper either.
so including days too.
then the modulo 30 thing, even though that on top changes month for month.
so month and year to be included as well.
so we would need the whole date, everything from current year to second (because second would be nice too, for precision)
and comparing them would require tons of if clauses for year, month, etc.
do the date objects have some predfeined date comparision function that actually keeps all these things in mind (havent even mentioned leap years yet, have I)?
time would be very important cause exactly at the 59 minutes mark (+-max 5 seconds wouldnt matter but getting rmeitely close to 60 is forbidden)
a certain function would have to be used that without fail closes a website.
script opens website at mark 0 min, does some stuff rinse and repeat style and closes page at 59 min mark.
checking the time like every few seconds would be smart.
Any good ideas how to implement such a time comparision that doesnt take too more computer power yet is efficient as in new month starting and stuff doesnt mess it up?
You can compare the two Date times, but when creating a date time there is a parameter of DateTime(value) which you can use.
You can use this API to get the current UTC time which returns a example JSON array like this:
{
"$id":"1",
"currentDateTime":"2019-11-09T21:12Z",
"utcOffset":"00:00:00",
"isDayLightSavingsTime":false,
"dayOfTheWeek":"Saturday",
"timeZoneName":"UTC",
"currentFileTime":132178075626292927,
"ordinalDate":"2019-313",
"serviceResponse":null
}
So you can use either the currentFileTime or the currentDateTime return from that API to construct your date object.
Example:
const date1 = new Date('2019-11-09T21:12Z') // time when I started writing this answer
const date2 = new Date('2019-11-09T21:16Z') // time when I finished writing this answer
const diff = new Date(date2-date1)
console.log(diff.toTimeString()) // time it took me to write this
Please keep in mind that due to network speeds, the time API will be a little bit off (by a few milliseconds)
I want to fetch record from the sys_user table which is updated at or after certain time stamp.
for that I have created rest request as
https:/service-now.com/api/now/v1//table/sys_user?sysparm_query=sys_updated_on>=javascript:gs.dateGenerate('2017-10-30','01:25:00')
I had converted current time which is in IST format into GMT and pass it to dateGenerate() function.
Problem statement -
I don't want to convert the IST to GMT, is there any way by which i can identify ServiceNow instance time zone at runtime and convert given time into that time stamp and get the users.
If i can pass this date and time in UTC format.
Ahoy!
This is a great question, and something that's quite difficult in ServiceNow (dealing with time-zones).
As such, I've written a tool to manage this for you. It's totally free!
The tool is called TimeZoneUtil, and can be found here:
https://snprotips.com/blog/2017/9/12/handling-timezones-in-servicenow-timezoneutil
You simply need to initialize a GlideDateTime object, set its' time-zone to IST, use setDisplayValue() to set its' time based on IST current time, then use .getValue() to get that same time in system time.
This is because getDisplayValue()/setDisplayValue() work based on time-zone, whereas setValue()/getValue() always return the corresponding system time.
EDIT: In order to make this a little more clear, I'll provide some example usage below.
var tz = new TimeZoneUtils(); //initialize with current time
gs.print(tz.getOffsetHours()); //prints out "-7" in my instance, as the system time is in Pacific.
tz.setTimeZone('Asia/Kolkata'); //sets the time-zone to IST/UTC+5.5
gs.print(tz.getOffsetHours()); //prints "5.5".
gs.print(tz.getGDT().getDisplayValue()); //Prints the current time in IST (2017-11-01 20:52:31 at the moment).
gs.print(tz.getGDT().getValue()); //Prints the current time in system time (2017-11-01 15:23:12 at present).
gs.print(new TimeZoneUtils().setTimeZone('Asia/Kolkata').getDisplayValue()); //Single line, also prints current time in IST: 2017-11-01 20:52:31
The first 6 lines there, demonstrate basic usage and explain how it works.
The eighth line however, demonstrates usage on a single line, which you can use inside a query string. For example:
sysparm_query=sys_updated_on>=javascript:new TimeZoneUtils().setTimeZone('Asia/Kolkata').getDisplayValue()
Hope this helps!
Tim Woodruff
Author, Learning ServiceNow & Building Powerful Workflows
Owner/Founder, SN Pro Tips
How do you convert a timezone from int to string (etc: Europe/Stockholm)?
I'm using Facebooks PHP api and that returns ["timezone"] => int(2). How am I suppose to parse that?
How do you convert a timezone from int to string (etc: Europe/Stockholm)?
You can't. Read "Time Zone != Offset" in the timezone tag wiki.
Facebook's documentation explains that the timezone field is the user's timezone offset from UTC.
What it doesn't make clear, but I have found through experimentation, is that it is not necessarily the user's current offset, but it instead it is the offset as of the user's last log in. If the user changes time zones, or daylight saving time begins or ends, that will not be reflected in the Facebook data until the user's next log in.
See also these posts:
Facebook API, timezone and country
FaceBook Time zone and Event Times
You can get the timezone name by using timezone_name_from_abbr("", $value*3600, false);. $value is the timezone offset you get from Facebook.
Thanks to minaz.
I was using the Hipchat API (v2) a bit today and ran into an odd issue where I was not able to really pull up all of the history for a room. It seemed as though when I queried a specific date, for example, it would only retrieve a fraction of the history for that date given. I had had plans to simply iterate across all of the dates for a Room to extract the history in a format that I could use, but ended up hitting this and am now unsure if it is really possible to pull out the history fully.
I realize that this is a bit clunky. It is pulling the JSON as a string and then I have to form it into a hash so I know I'm not doing this as good as it could be done, but here is roughly what I quickly did just to test out the history method for the API:
api_token = "MY_TOKEN"
client = HipChat::Client.new(api_token, :api_version => 'v2')
history = client['ROOM_NAME'].history
history = JSON.parse(history)
history.each do |key, history|
if history.is_a? Array
history.each do |message|
if message.is_a? Hash
puts "#{message['from']['name']}: #{message['message']}"
end
end
end
end
Obviously then the extension to that was to just curse through the dates in the desired range (using: client['ROOM_NAME'].history(:date => '2010-11-19', :timezone => 'PST')), but again, I was only getting a fraction of the history for the room. Are there some additional parameters that I'm missing for this to make it work as expected?
I got this working but it was a big pain.
Start by sending a query with the current time, in UTC, but without including the time zone, as the start date:
https://internal-hipchat-server/v2/room/2/history?reverse=false&date=2015-06-25T20:42:18.658439&max-results=1000&auth_token=XXX
This is very fiddly:
If you specify just the current date, without a timezone, as documented in the API, it is interpreted as midnight last night and you only get messages from yesterday or older.
If you try specifying tomorrow’s date instead, the response is 400 Bad Request This day has not yet come to pass.
If you specify the time as 2015-06-25T20:42:18.658439+00:00, which is the format that times come in HipChat API responses, HipChat’s parser seems to fail and interpret it as midnight last night.
When you get the response back, take the oldest items.date property, strip the timezone, and resubmit the above URL with an updated date parameter:
https://internal-hipchat-server/v2/room/2/history?reverse=false&date=2015-06-17T19:56:34.533182&max-results=1000&auth_token=XXX
Be sure to include the microseconds, in case a notification posted multiple messages to the same room in the same second.
This will get you the next page of messages. Keep doing this until you get fewer than max-results messages back.
There is a start-index parameter I tried passing before I got the above working, and it will give you a few pages of results, with responses lacking a links.next property, but it won’t give you the full history. On a chatroom with 9166 messages in the history according to statistics.messages_sent, it only returned 3217 messages. So don’t use it. You can use statistics.messages_sent as a sanity check for whether you get all messages.
Oh yeah, and the last_active property in the /v2/room call cannot be trusted because it doesn’t update when notification messages are posted to the room.
I am trying to get the Timezone of the device (windows phone). I used this class and the property BaseUtcOffset. I live In Jordan, and it was suppose to give me +3 hours, but instead it gave me +2. i think its the daylight saving time, but i have no idea how to use it, any ideas?
var x = TimeZoneInfo.Local.BaseUtcOffset; // x.Hours = 2
the correct timezone from timeanddate.com
You should use GetUtcOffset().
The BaseUtcOffset property returns the difference between UTC and the time zone's standard time; the GetUtcOffset method returns the difference between UTC and the time zone's time at a particular point in time.
That's the right response. The timezone is 2 hours ahead of UTC. Local time is 3 hours ahead of UTC.
You might want to look at GetUtcOffset() or IsDaylightSavingsTime().