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C comment: mention why the Gregorian calendar is used pre-1582

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Original file line number	Diff line number	Diff line change
`@@ -271,6 +271,11 @@ extern const char const months[];/ months (3-char abbreviations) */`
`271`	`271`	`externconstcharconstdays[];/ days (full names) */`
`272`	`272`	`externconstintday_tab[2][13];`
`273`	`273`
	`274`	`+/*`
	`275`	`+ * These are the rules for the Gregorian calendar, which was adopted in 1582.`
	`276`	`+ * However, we use this calculation for all prior years as well because the`
	`277`	`+ * SQL standard specifies use of the Gregorian calendar.`
	`278`	`+ */`
`274`	`279`	`#defineisleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 \|\| ((y) % 400) == 0))`
`275`	`280`
`276`	`281`

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