Given a date, return the first day of the calendar quarter that the date falls in. The quarters are divided as follows:
- Q1: January, February, March (starts January 1)
- Q2: April, May, June (starts April 1)
- Q3: July, August, September (starts July 1)
- Q4: October, November, December (starts October 1)
Return null for null input.
Examples:
Input: inputDate = Date.newInstance(2026, 2, 15)
Output: Date.newInstance(2026, 1, 1)
Explanation: February falls in Q1 which starts on January 1
Input: inputDate = Date.newInstance(2026, 5, 20)
Output: Date.newInstance(2026, 4, 1)
Explanation: May falls in Q2 which starts on April 1
Input: inputDate = Date.newInstance(2026, 9, 1)
Output: Date.newInstance(2026, 7, 1)
Explanation: September falls in Q3 which starts on July 1
Input: inputDate = Date.newInstance(2026, 11, 30)
Output: Date.newInstance(2026, 10, 1)
Explanation: November falls in Q4 which starts on October 1
Input: inputDate = null
Output: null
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