Rename mysqlDateFromDayNumber to export

Signed-off-by: Noble Mittal <noblemittal@outlook.com>

go/mysql/datetime/datetime.go

@@ -615,13 +615,13 @@ func (dt *DateTime) addInterval(itv *Interval) bool {
 			return false
 		}
 
-		dt.Date.year, dt.Date.month, dt.Date.day = mysqlDateFromDayNumber(daynum)
+		dt.Date.year, dt.Date.month, dt.Date.day = MysqlDateFromDayNumber(daynum)
 		return true
 
 	case itv.unit.HasDayParts():
 		daynum := mysqlDayNumber(dt.Date.Year(), dt.Date.Month(), dt.Date.Day())
 		daynum += itv.day
-		dt.Date.year, dt.Date.month, dt.Date.day = mysqlDateFromDayNumber(daynum)
+		dt.Date.year, dt.Date.month, dt.Date.day = MysqlDateFromDayNumber(daynum)
 		return true
 
 	case itv.unit.HasMonthParts():

go/mysql/datetime/mydate.go

@@ -23,8 +23,8 @@ package datetime
 // day count that traditional datetime systems use (e.g. the daycount
 // algorithm in the Go standard library). It is often off by one, possibly
 // because of incorrect leap year handling, but the inverse of the algorithm
-// in mysqlDateFromDayNumber takes this into account. Hence, the results
-// of this function can ONLY be passed to mysqlDateFromDayNumber; using
+// in MysqlDateFromDayNumber takes this into account. Hence, the results
+// of this function can ONLY be passed to MysqlDateFromDayNumber; using
 // a day number with one of Go's datetime APIs will return incorrect results.
 // This API should only be used when performing datetime calculations (addition
 // and subtraction), so that the results match MySQL's. All other date handling
@@ -46,15 +46,15 @@ func mysqlDayNumber(year, month, day int) int {
 	return days + year/4 - leapAdjust
 }
 
-// mysqlDateFromDayNumber converts an absolute day number into a date (a year, month, day triplet).
+// MysqlDateFromDayNumber converts an absolute day number into a date (a year, month, day triplet).
 // This is an algorithm that has been reverse engineered from MySQL;
 // the tables used as a reference can be found in `testdata/daynr_to_date.json`.
 // See the warning from mysqlDayNumber: the day number used as an argument to
 // this function must come from mysqlDayNumber or the results won't be correct.
 // This API should only be used when performing datetime calculations (addition
 // and subtraction), so that the results match MySQL's. All other date handling
 // operations must use our helpers based on Go's standard library.
-func mysqlDateFromDayNumber(daynr int) (uint16, uint8, uint8) {
+func MysqlDateFromDayNumber(daynr int) (uint16, uint8, uint8) {
 	if daynr <= 365 || daynr >= 3652500 {
 		return 0, 0, 0
 	}

go/mysql/datetime/mydate_test.go

@@ -49,7 +49,7 @@ func TestDayNumberFields(t *testing.T) {
 	require.NoError(t, err)
 
 	for _, tc := range expected {
-		y, m, d := mysqlDateFromDayNumber(tc[0])
+		y, m, d := MysqlDateFromDayNumber(tc[0])
 		assert.Equal(t, tc[1], int(y))
 		assert.Equal(t, tc[2], int(m))
 		assert.Equal(t, tc[3], int(d))