JS: Add some to-cstring converters for DateTime (#21912)

Add some to-cstring converters for DateTime

Changelog update

changelogs/changelog_2_0_0.md

@@ -175,7 +175,7 @@
   type _ = float
   ```
 
-- - Added the `--legacy:verboseTypeMismatch` switch to get legacy type mismatch error messages.
+- Added the `--legacy:verboseTypeMismatch` switch to get legacy type mismatch error messages.
 
 - The JavaScript backend now uses [BigInt](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt)
   for 64-bit integer types (`int64` and `uint64`) by default. As this affects
@@ -310,9 +310,6 @@
   - Added `std/paths`, `std/dirs`, `std/files`, `std/symlinks` and `std/appdirs`.
   - Added `std/cmdline` for reading command line parameters.
 - Added `sep` parameter in `std/uri` to specify the query separator.
-- Added bindings to [`Array.shift`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/shift)
-  and [`queueMicrotask`](https://developer.mozilla.org/en-US/docs/Web/API/queueMicrotask)
-  in `jscore` for JavaScript targets.
 - Added `UppercaseLetters`, `LowercaseLetters`, `PunctuationChars`, `PrintableChars` sets to `std/strutils`.
 - Added `complex.sgn` for obtaining the phase of complex numbers.
 - Added `insertAdjacentText`, `insertAdjacentElement`, `insertAdjacentHTML`,
@@ -327,6 +324,11 @@
 - Added `safe` parameter to `base64.encodeMime`.
 - Added `parseutils.parseSize` - inverse to `strutils.formatSize` - to parse human readable sizes.
 - Added `minmax` to `sequtils`, as a more efficient `(min(_), max(_))` over sequences.
+- `std/jscore` for JavaScript targets:
+  + Added bindings to [`Array.shift`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/shift)
+  and [`queueMicrotask`](https://developer.mozilla.org/en-US/docs/Web/API/queueMicrotask).
+  + Added `toDateString`, `toISOString`, `toJSON`, `toTimeString`, `toUTCString` converters for `DateTime`.
+
 
 [//]: # "Deprecations:"
 - Deprecated `selfExe` for Nimscript.

lib/js/jscore.nim

@@ -95,20 +95,27 @@ proc getMilliseconds*(d: DateTime): int {.importcpp.}
 proc getMinutes*(d: DateTime): int {.importcpp.}
 proc getMonth*(d: DateTime): int {.importcpp.}
 proc getSeconds*(d: DateTime): int {.importcpp.}
-proc getYear*(d: DateTime): int {.importcpp.}
 proc getTime*(d: DateTime): int {.importcpp.}
-proc toString*(d: DateTime): cstring {.importcpp.}
+proc getTimezoneOffset*(d: DateTime): int {.importcpp.}
 proc getUTCDate*(d: DateTime): int {.importcpp.}
+proc getUTCDay*(d: DateTime): int {.importcpp.}
 proc getUTCFullYear*(d: DateTime): int {.importcpp.}
 proc getUTCHours*(d: DateTime): int {.importcpp.}
 proc getUTCMilliseconds*(d: DateTime): int {.importcpp.}
 proc getUTCMinutes*(d: DateTime): int {.importcpp.}
 proc getUTCMonth*(d: DateTime): int {.importcpp.}
 proc getUTCSeconds*(d: DateTime): int {.importcpp.}
-proc getUTCDay*(d: DateTime): int {.importcpp.}
-proc getTimezoneOffset*(d: DateTime): int {.importcpp.}
+proc getYear*(d: DateTime): int {.importcpp.}
+
 proc setFullYear*(d: DateTime, year: int) {.importcpp.}
 
+func toDateString*(d: DateTime): cstring {.importcpp.}
+func toISOString*(d: DateTime): cstring {.importcpp.}
+func toJSON*(d: DateTime): cstring {.importcpp.}
+proc toString*(d: DateTime): cstring {.importcpp.}
+func toTimeString*(d: DateTime): cstring {.importcpp.}
+func toUTCString*(d: DateTime): cstring {.importcpp.}
+
 #JSON library
 proc stringify*(l: JsonLib, s: JsRoot): cstring {.importcpp.}
 proc parse*(l: JsonLib, s: cstring): JsRoot {.importcpp.}