Calculate the number of days between today and a target date. Return null if the target date is null or in the past. Return 0 if the target date is today.
Examples:
Date targetDate = Date.today().addDays(10); Integer days = daysUntilDate(targetDate); // Results: 10 // Explanation: Returns number of days until target date Date targetDate = Date.today(); Integer days = daysUntilDate(targetDate); // Results: 0 // Explanation: Returns 0 when target date is today Date targetDate = Date.today().addDays(-5); Integer days = daysUntilDate(targetDate); // Results: null // Explanation: Returns null for past dates
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