fix: localTime to support 0 (number) as input

Before: it threw "cannot construct LocalTime of 0"
After: correctly constructs LocalTime with 1970-01-01T00:00:00

Author: kirillgroshkov

src/datetime/localTime.test.ts

@@ -126,6 +126,8 @@ test('basic', () => {
     `"Cannot parse "undefined" into LocalTime"`,
   )
 
+  expect(localTime(0).toISODateTime()).toMatchInlineSnapshot(`"1970-01-01T00:00:00"`)
+
   expect(localTime.getTimezone()).toBe('UTC')
   expect(localTime.isTimezoneValid('Europe/Stockholm')).toBe(true)
   expect(localTime.isTimezoneValid('Europe/Stockholm2')).toBe(false)

src/datetime/localTime.ts

@@ -714,7 +714,6 @@ class LocalTimeFactory {
    * Returns null if invalid
    */
   parseOrNull(d: LocalTimeInputNullable): LocalTime | null {
-    if (!d) return null
     if (d instanceof LocalTime) return d
 
     let date
@@ -723,6 +722,9 @@ class LocalTimeFactory {
       date = d
     } else if (typeof d === 'number') {
       date = new Date(d * 1000)
+    } else if (!d) {
+      // This check is after checking the number, to support `0`
+      return null
     } else if (typeof (d as any) !== 'string') {
       // unexpected type, e.g Function or something
       return null