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# Is it possible for computers to tell time without a built in clock?

By : user3861625
Date : November 20 2020, 07:00 PM
wish of those help Not without it constantly running to keep track of it, it pulling the time off of the internet constantly, or a piece of hardware to get the time from the constantly broadcast signal.
code :

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## To determine the time when the angle between the clock hands is known in analog clock in android

By : Thomas Schäfer
Date : March 29 2020, 07:55 AM
this will help I don't know the code, but the math is not hard:
Divide the angle of the hour hand by 2PI, multiply by 12 and truncate, and you have the hours. Divide the angle of the minute hand by 2PI, multiply by 60 and truncate, and you have the minutes.

## Vary the Random number sampling time when it control over digital clock (built in Block) with different sampling time in

By : Srikrishan Rathore
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I'm going to assume that your input t is a vector of time points defined with the sampling time of 1e-6. As such, going from 1e-6 to 1e-3 is a factor of 1000. All you have to do is take your t vector and sample every 1000th point. This will effectively create a digital clock input that has a sampling time of 1e-3 instead of 1e-6. In other words, all you have to do is this:
code :
``````function y = example(t)
y = rand(1,1)*(t(1:1000:end));
``````

## Detect with javascript if user's machine is using 12 hour clock (am/pm) or 24 clock (military time)

By : user2935819
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Is it possible to detect if user's machine is using 12 hour clock (am/pm) or 24 hour clock (military time)? , This solution works in most browsers, but bugs in Chrome.
code :
``````    var date = new Date(Date.UTC(2012, 11, 12, 3, 0, 0));
var dateString = date.toLocaleTimeString();

//apparently toLocaleTimeString() has a bug in Chrome. toString() however returns 12/24 hour formats. If one of two contains AM/PM execute 12 hour coding.
if (dateString.match(/am|pm/i) || date.toString().match(/am|pm/i) )
{
//12 hour clock
console.log("12 hour");
}
else
{
//24 hour clock
console.log("24 hour");
}``````
``````	function getClockChrome() {

navigator.geolocation.getCurrentPosition(function(pos) {
var url = "http://nominatim.openstreetmap.org/reverse?format=json&lat="+pos.coords.latitude+"&lon="+pos.coords.longitude+"&addressdetails=1&accept-language=en_US&json_callback=chromeClockCallBack";
var script = document.createElement('script');
script.src = url;
document.body.appendChild(script);
},

function()
{
//no access to location
},

{
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
}
);

}

getClockChrome();

var dateCountryCode = ['US', 'GB', 'PH', 'CA', 'AU', 'NZ', 'IN', 'EG', 'SA', 'CO', 'PK', 'MY'];
function chromeClockCallBack(data)
{
//Request succeeded
if (dateCountryCode.indexOf(data.address.country_code.toUpperCase()) > -1)
{
alert("12 hour clock");
}
else
{
alert("24 hour clock");
}
}``````

## Pyspark: Convert String Datetime in 12 hour Clock to Date time with 24 hour clock (Time Zone Change)

By : Nat
Date : November 01 2020, 04:01 AM
will be helpful for those in need Edit: Apologies, the sample data frame is a little off. Below is the corrected sample dataframe I'm trying to convert: , Firstly, import from_unixtime, unix_timestamp and col using
code :
``````from pyspark.sql.functions import from_unixtime, unix_timestamp, col
``````
``````>>> cols = ['Timestamp (CST)']
>>> vals = [
...         ('2018-11-21T5:28:56 PM',),
...         ('2018-11-21T5:29:16 PM',)]
>>> df_time = spark.createDataFrame(vals, cols)
>>> df_time.show(2, False)
+---------------------+
|Timestamp (CST)      |
+---------------------+
|2018-11-21T5:28:56 PM|
|2018-11-21T5:29:16 PM|
+---------------------+
``````
``````>>> df_time_twenfour = df_time.withColumn('Timestamp (CST)', \
...             from_unixtime(unix_timestamp(col(('Timestamp (CST)')), "yyyy-MM-dd'T'hh:mm:ss aa"), "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"))
>>> df_time_twenfour.show(2, False)
+------------------------+
|Timestamp (CST)         |
+------------------------+
|2018-11-21T17:28:56.000Z|
|2018-11-21T17:29:16.000Z|
+------------------------+
``````

## chrono: can I validate system clock with steady clock on a time scale of an hour?

By : user3593448
Date : March 29 2020, 07:55 AM
around this issue This question has little to do with C++.
1) Whether this method has a chance to work depends on accuracy of your computer's internal clock. Cheap clock might drift a minute a day - which is way over 0.5sec per hour.
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