如何在JavaScript/Node.js中判断时间是否在指定区间及校验门店营业状态

Alright, let's break this down step by step for both your questions!

The easiest way to handle this is to convert all time values into total minutes since midnight—this avoids dealing with date objects and simplifies comparisons. You also need to account for two scenarios: ranges that don't cross midnight (e.g., 9 AM to 9 PM) and ranges that do (e.g., 10 PM to 6 AM).

Here's a reusable function to do this:

function isTimeInRange(givenTime, startTime, endTime) {
  // Convert time strings (like "14:30") to total minutes since midnight
  const timeToMinutes = (timeStr) => {
    const [hours, minutes] = timeStr.split(':').map(Number);
    return hours * 60 + minutes;
  };

  const givenMins = timeToMinutes(givenTime);
  const startMins = timeToMinutes(startTime);
  const endMins = timeToMinutes(endTime);

  // Handle non-midnight-crossing ranges
  if (startMins <= endMins) {
    return givenMins >= startMins && givenMins <= endMins;
  } 
  // Handle ranges that cross midnight (e.g., 22:00 to 06:00)
  else {
    return givenMins >= startMins || givenMins <= endMins;
  }
}

// Example usage
console.log(isTimeInRange("15:00", "09:00", "21:00")); // true
console.log(isTimeInRange("02:00", "22:00", "06:00")); // true
console.log(isTimeInRange("07:00", "22:00", "06:00")); // false

For your fashion app backend, let's assume your database stores store hours as string values (e.g., openingTime: "10:00", closingTime: "22:30"—this is the most common setup). We'll reuse the function above, paired with grabbing the current time to compare against the store's hours.

Example Implementation: #

// Sample store data fetched from your database
const fashionStore = {
  id: 42,
  name: "Urban Chic Boutique",
  openingTime: "10:00",
  closingTime: "22:30"
};

function getStoreStatus(store) {
  // Get current local time in HH:mm format
  const now = new Date();
  const currentTime = `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}`;

  // Use our time range checker function
  const isOpen = isTimeInRange(currentTime, store.openingTime, store.closingTime);
  
  return isOpen ? "营业中" : "已打烊";
}

// Check status
console.log(getStoreStatus(fashionStore)); // Outputs "营业中" or "已打烊" based on current time

Important Note on Time Zones: #

If your stores are located in different time zones, using local server time will lead to incorrect results. To fix this:

• Convert the current time to the store's time zone before comparison. You can do this natively with Intl.DateTimeFormat:

  // Example: Get current time in Tokyo time zone (HH:mm)
  const tokyoTime = new Date().toLocaleTimeString('en-US', {
    timeZone: 'Asia/Tokyo',
    hour12: false,
    hour: '2-digit',
    minute: '2-digit'
  });
  

• For more complex time zone handling, consider using libraries like moment-timezone or luxon (install them directly in your Node.js project via npm/yarn).

内容的提问来源于stack exchange，提问作者Vikas Valechha