2795     string toISOString() const @safe pure nothrow  in toISOString()  function
2801                 _date.toISOString(),  in toISOString()
2816         assert(DateTime(Date(2010, 7, 4), TimeOfDay(7, 6, 12)).toISOString() ==
2819         assert(DateTime(Date(1998, 12, 25), TimeOfDay(2, 15, 0)).toISOString() ==
2822         assert(DateTime(Date(0, 1, 5), TimeOfDay(23, 9, 59)).toISOString() ==
2825         assert(DateTime(Date(-4, 1, 5), TimeOfDay(0, 0, 2)).toISOString() ==
2832         assert(DateTime(Date(9, 12, 4), TimeOfDay(0, 0, 0)).toISOString() == "00091204T000000");
2833         assert(DateTime(Date(99, 12, 4), TimeOfDay(5, 6, 12)).toISOString() == "00991204T050612");
2834 …      assert(DateTime(Date(999, 12, 4), TimeOfDay(13, 44, 59)).toISOString() == "09991204T134459");
2835 …      assert(DateTime(Date(9999, 7, 4), TimeOfDay(23, 59, 59)).toISOString() == "99990704T235959");
2836 …    assert(DateTime(Date(10000, 10, 20), TimeOfDay(1, 1, 1)).toISOString() == "+100001020T010101");
2839         assert(DateTime(Date(0, 12, 4), TimeOfDay(0, 12, 4)).toISOString() == "00001204T001204");
2840         assert(DateTime(Date(-9, 12, 4), TimeOfDay(0, 0, 0)).toISOString() == "-00091204T000000");
2841         assert(DateTime(Date(-99, 12, 4), TimeOfDay(5, 6, 12)).toISOString() == "-00991204T050612");
2842 …    assert(DateTime(Date(-999, 12, 4), TimeOfDay(13, 44, 59)).toISOString() == "-09991204T134459");
2843 …    assert(DateTime(Date(-9999, 7, 4), TimeOfDay(23, 59, 59)).toISOString() == "-99990704T235959");
2844 …   assert(DateTime(Date(-10000, 10, 20), TimeOfDay(1, 1, 1)).toISOString() == "-100001020T010101");
2848         assert(cdt.toISOString() == "19990706T123033");
2849         assert(idt.toISOString() == "19990706T123033");
2988         cares about the format of the string should use `toISOString`,
7032     string toISOString() const @safe pure nothrow  in toISOString()  function
7056         assert(Date(2010, 7, 4).toISOString() == "20100704");
7057         assert(Date(1998, 12, 25).toISOString() == "19981225");
7058         assert(Date(0, 1, 5).toISOString() == "00000105");
7059         assert(Date(-4, 1, 5).toISOString() == "-00040105");
7065         assert(Date(9, 12, 4).toISOString() == "00091204");
7066         assert(Date(99, 12, 4).toISOString() == "00991204");
7067         assert(Date(999, 12, 4).toISOString() == "09991204");
7068         assert(Date(9999, 7, 4).toISOString() == "99990704");
7069         assert(Date(10000, 10, 20).toISOString() == "+100001020");
7072         assert(Date(0, 12, 4).toISOString() == "00001204");
7073         assert(Date(-9, 12, 4).toISOString() == "-00091204");
7074         assert(Date(-99, 12, 4).toISOString() == "-00991204");
7075         assert(Date(-999, 12, 4).toISOString() == "-09991204");
7076         assert(Date(-9999, 7, 4).toISOString() == "-99990704");
7077         assert(Date(-10000, 10, 20).toISOString() == "-100001020");
7081         assert(cdate.toISOString() == "19990706");
7082         assert(idate.toISOString() == "19990706");
7210         cares about the format of the string should use `toISOString`,
8647     string toISOString() const @safe pure nothrow  in toISOString()  function
8659         assert(TimeOfDay(0, 0, 0).toISOString() == "000000");
8660         assert(TimeOfDay(12, 30, 33).toISOString() == "123033");
8668         assert(tod.toISOString() == "123033");
8669         assert(ctod.toISOString() == "123033");
8670         assert(itod.toISOString() == "123033");
8716         cares about the format of the string should use `toISOString`,