Add toString, toDateString and toTimeString to Date

std/assembly/date.ts

@@ -208,6 +208,50 @@ export class Date {
  "Z"
  );
  }
+
+ toDateString(): string {
+ // TODO: use u64 static data instead 4 chars
+ // also use stream itoa variants.
+ const weeks: StaticArray<string> = [
+ "Sun ", "Mon ", "Tue ", "Wed ", "Thu ", "Fri ", "Sat "
+ ];
+
+ const months: StaticArray<string> = [
+ "Jan ", "Feb ", "Mar ", "Apr ", "May ", "Jun ",
+ "Jul ", "Aug ", "Sep ", "Oct ", "Nov ", "Dec "
+ ];
+
+ var mo = this.month;
+ var da = this.day;
+ var yr = this.year;
+ var wd = dayOfWeek(yr, mo, da);
+ var year = abs(yr).toString().padStart(4, "0");
+ if (yr < 0) year = "-" + year;
+
+ return (
+ unchecked(weeks[wd]) +
+ unchecked(months[mo - 1]) +
+ da.toString().padStart(2, "0") +
+ " " + year
+ );
+ }
+
+ // Note: it uses UTC time instead local time (without timezone offset)
+ toTimeString(): string {
+ // TODO: add timezone
+ return (
+ this.getUTCHours().toString().padStart(2, "0") +
+ ":" +
+ this.getUTCMinutes().toString().padStart(2, "0") +
+ ":" +
+ this.getUTCSeconds().toString().padStart(2, "0")
+ );
+ }
+
+ // Note: it uses UTC datetime instead local datetime (without timezone offset)
+ toString(): string {
+ return this.toDateString() + " " + this.toTimeString();
+ }
 }
 
 function epochMillis(
@@ -275,7 +319,7 @@ function dayOfWeek(year: i32, month: i32, day: i32): i32 {
  const tab = memory.data<u8>([0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4]);
 
  year -= i32(month < 3);
- year += year / 4 - year / 100 + year / 400;
+ year += floorDiv(year, 4) - floorDiv(year, 100) + floorDiv(year, 400);
  month = <i32>load<u8>(tab + month - 1);
  return euclidRem(year + month + day, 7);
 }

std/assembly/index.d.ts

@@ -1756,7 +1756,10 @@ declare class Date {
  setUTCSeconds(value: i32): void;
  setUTCMilliseconds(value: i32): void;
 
+ toString(): string;
  toISOString(): string;
+ toDateString(): string;
+ toTimeString(): string;
 }
 
 /** Class for representing a runtime error. Base class of all errors. */