curl --request POST \
  --url https://api.everhour.com/timers \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "task": "ev:9876543210",
  "userDate": "2018-01-16",
  "comment": "some notes"
}
'

import requests

url = "https://api.everhour.com/timers"

payload = {
    "task": "ev:9876543210",
    "userDate": "2018-01-16",
    "comment": "some notes"
}
headers = {
    "X-Api-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-Api-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({task: 'ev:9876543210', userDate: '2018-01-16', comment: 'some notes'})
};

fetch('https://api.everhour.com/timers', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.everhour.com/timers",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'task' => 'ev:9876543210',
    'userDate' => '2018-01-16',
    'comment' => 'some notes'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Api-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.everhour.com/timers"

	payload := strings.NewReader("{\n  \"task\": \"ev:9876543210\",\n  \"userDate\": \"2018-01-16\",\n  \"comment\": \"some notes\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-Api-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.everhour.com/timers")
  .header("X-Api-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"task\": \"ev:9876543210\",\n  \"userDate\": \"2018-01-16\",\n  \"comment\": \"some notes\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.everhour.com/timers")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-Api-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"task\": \"ev:9876543210\",\n  \"userDate\": \"2018-01-16\",\n  \"comment\": \"some notes\"\n}"

response = http.request(request)
puts response.read_body

{
  "status": "active",
  "duration": 16,
  "today": 7200,
  "startedAt": "2018-01-16 12:42:59",
  "userDate": "2018-01-16",
  "comment": "<string>",
  "task": {
    "id": "ev:9876543210",
    "name": "Task Name",
    "projects": [
      "ev:1234567890"
    ],
    "section": 1234,
    "labels": [
      "high",
      "bug"
    ],
    "position": 1,
    "description": "<string>",
    "dueAt": "2018-03-05 16:00:00",
    "status": "open",
    "time": {
      "total": 7200,
      "users": {
        "1304": 3600,
        "1543": 3600
      }
    },
    "estimate": {
      "total": 7200,
      "type": "overall",
      "users": {
        "1304": 3600,
        "1543": 3600
      }
    },
    "attributes": {
      "Client": "Everhour",
      "Priority": "high"
    },
    "metrics": {
      "efforts": 42,
      "expenses": 199
    },
    "unbillable": true
  },
  "user": {
    "id": 1304,
    "name": "User Name",
    "role": "admin",
    "status": "active",
    "headline": "CEO",
    "avatarUrl": "<string>",
    "phone": "<string>",
    "capacity": 123,
    "avatarUrlLarge": "<string>"
  },
  "currentTaskTime": {
    "id": 2660155,
    "time": 3600,
    "user": 1304,
    "date": "2018-01-20",
    "task": {
      "id": "ev:9876543210",
      "name": "Task Name",
      "projects": [
        "ev:1234567890"
      ],
      "section": 1234,
      "labels": [
        "high",
        "bug"
      ],
      "position": 1,
      "description": "<string>",
      "dueAt": "2018-03-05 16:00:00",
      "status": "open",
      "time": {
        "total": 7200,
        "users": {
          "1304": 3600,
          "1543": 3600
        }
      },
      "estimate": {
        "total": 7200,
        "type": "overall",
        "users": {
          "1304": 3600,
          "1543": 3600
        }
      },
      "attributes": {
        "Client": "Everhour",
        "Priority": "high"
      },
      "metrics": {
        "efforts": 42,
        "expenses": 199
      },
      "unbillable": true
    },
    "isLocked": false,
    "isInvoiced": false,
    "comment": "some notes"
  },
  "website": {
    "url": "<string>",
    "title": "<string>"
  }
}