Javascript timestamp grouped by X minutes

Javascript timestamp grouped by X minutes

To group timestamps by a specified number of minutes in JavaScript, you can follow these steps:

  1. Convert the timestamps to a suitable format.
  2. Create a function to group the timestamps based on the specified interval.

Here's an example that demonstrates how to group an array of timestamps by a given number of minutes:

Example Code

function groupTimestamps(timestamps, intervalMinutes) { const grouped = {}; timestamps.forEach(timestamp => { // Round down to the nearest interval const date = new Date(timestamp); const roundedDate = new Date(Math.floor(date.getTime() / (intervalMinutes * 60 * 1000)) * (intervalMinutes * 60 * 1000)); // Convert rounded date to ISO string for use as a key const key = roundedDate.toISOString(); // Initialize array if key doesn't exist if (!grouped[key]) { grouped[key] = []; } // Add original timestamp to the group grouped[key].push(timestamp); }); return grouped; } // Example usage const timestamps = [ new Date('2024-07-17T12:00:00Z').getTime(), new Date('2024-07-17T12:05:00Z').getTime(), new Date('2024-07-17T12:10:00Z').getTime(), new Date('2024-07-17T12:12:00Z').getTime(), new Date('2024-07-17T12:20:00Z').getTime(), ]; const interval = 10; // Group by 10 minutes const result = groupTimestamps(timestamps, interval); console.log(result);

Explanation

  1. Function Definition: The groupTimestamps function takes an array of timestamps and the grouping interval in minutes.

  2. Rounding Timestamps: For each timestamp:

    • Convert the timestamp to a Date object.
    • Calculate the rounded date by flooring the time divided by the interval (in milliseconds) and multiplying back to get the start of the interval.

  3. Grouping: Use the rounded date as a key in the grouped object:

    • If the key doesn't exist, initialize it with an empty array.
    • Push the original timestamp into the corresponding array.

  4. Return the Grouped Object: After processing all timestamps, the function returns the grouped object.

Example Output

For the provided timestamps and a 10-minute grouping interval, the output would look something like:

{ '2024-07-17T12:00:00.000Z': [ 1689598800000, // 12:00 1689599100000, // 12:05 1689599400000, // 12:10 1689599520000 // 12:12 ], '2024-07-17T12:20:00.000Z': [ 1689598800000 // 12:20 ] }

This shows the timestamps grouped by 10-minute intervals. You can adjust the interval variable to group by different time spans.

Examples

  1. "JavaScript group timestamps by 5 minutes"

    • Description: This query groups timestamps into 5-minute intervals.
    • Code:
      const groupByMinutes = (timestamps, interval) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getHours()}:${Math.floor(date.getMinutes() / interval) * interval}`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632938700000, 1632939000000, 1632939300000]; console.log(groupByMinutes(timestamps, 5));

  2. "JavaScript group timestamps by 15 minutes interval"

    • Description: This query groups timestamps into 15-minute intervals.
    • Code:
      const groupByMinutes = (timestamps, interval) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getHours()}:${Math.floor(date.getMinutes() / interval) * interval}`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632939000000, 1632939600000, 1632940200000]; console.log(groupByMinutes(timestamps, 15));

  3. "JavaScript group timestamps by 30 minutes"

    • Description: This query groups timestamps into 30-minute intervals.
    • Code:
      const groupByMinutes = (timestamps, interval) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getHours()}:${Math.floor(date.getMinutes() / interval) * interval}`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632940200000, 1632942000000]; console.log(groupByMinutes(timestamps, 30));

  4. "JavaScript group timestamps by 1 hour"

    • Description: This query groups timestamps into 1-hour intervals.
    • Code:
      const groupByHours = (timestamps) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()} ${date.getHours()}:00`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632942000000, 1632945600000]; console.log(groupByHours(timestamps));

  5. "JavaScript group timestamps by 10 minutes"

    • Description: This query groups timestamps into 10-minute intervals.
    • Code:
      const groupByMinutes = (timestamps, interval) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getHours()}:${Math.floor(date.getMinutes() / interval) * interval}`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632939000000, 1632939600000]; console.log(groupByMinutes(timestamps, 10));

  6. "JavaScript group timestamps by 2 hours"

    • Description: This query groups timestamps into 2-hour intervals.
    • Code:
      const groupByHours = (timestamps, interval) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()} ${Math.floor(date.getHours() / interval) * interval}:00`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632945600000, 1632952800000]; console.log(groupByHours(timestamps, 2));

  7. "JavaScript group timestamps by 3 hours"

    • Description: This query groups timestamps into 3-hour intervals.
    • Code:
      const groupByHours = (timestamps, interval) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()} ${Math.floor(date.getHours() / interval) * interval}:00`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1632949200000, 1632960000000]; console.log(groupByHours(timestamps, 3));

  8. "JavaScript group timestamps by 5 minutes and sort"

    • Description: This query groups timestamps into 5-minute intervals and sorts them.
    • Code:
      const groupByMinutes = (timestamps, interval) => { const groups = timestamps.reduce((acc, timestamp) => { const date = new Date(timestamp); const key = `${date.getHours()}:${Math.floor(date.getMinutes() / interval) * interval}`; if (!acc[key]) acc[key] = []; acc[key].push(timestamp); return acc; }, {}); return Object.keys(groups).sort().reduce((sorted, key) => { sorted[key] = groups[key]; return sorted; }, {}); }; const timestamps = [1632938400000, 1632938700000, 1632939000000]; console.log(groupByMinutes(timestamps, 5));

  9. "JavaScript group timestamps by 1 day"

    • Description: This query groups timestamps into 1-day intervals.
    • Code:
      const groupByDays = (timestamps) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const key = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1633024800000, 1633111200000]; console.log(groupByDays(timestamps));

  10. "JavaScript group timestamps by 1 week"

    • Description: This query groups timestamps into 1-week intervals.
    • Code:
      const groupByWeeks = (timestamps) => { return timestamps.reduce((groups, timestamp) => { const date = new Date(timestamp); const startOfWeek = date.getTime() - (date.getDay() * 24 * 60 * 60 * 1000); const key = `${new Date(startOfWeek).toISOString().split('T')[0]}`; if (!groups[key]) groups[key] = []; groups[key].push(timestamp); return groups; }, {}); }; const timestamps = [1632938400000, 1633024800000, 1633111200000]; console.log(groupByWeeks(timestamps));

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