Adding DateTime::ToString(fmt) formatting

DateTime%3A%3AToString-formating.md

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-| Code | What it does | Example |

DateTime_ToString_Formating.md

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+Supported DateTime format strings
+=================================
+| Code | Description | Example |
+|------|-------------|---------|
+| `%a` | Abbreviated weekday name | `Tue` |
+| `%A` | Full weekday name | `Tuesday` |
+| `%h` / `%b` | Abbreviated month name | `Sep` |
+| `%B` | Full month name | `September` |
+| `%C` | Century (year / 100) | `20` |
+| `%y` | Year, two digits, zero-padded | `26` |
+| `%Y` | Year, four digits | `2026` |
+| `%m` | Month, zero-padded | `09` |
+| `%d` | Day of month, zero-padded | `01` |
+| `%e` | Day of month, space-padded | ` 1` |
+| `%H` | Hour (24h), zero-padded | `13` |
+| `%I` | Hour (12h), zero-padded | `01` |
+| `%M` | Minute, zero-padded | `07` |
+| `%S` | Second, zero-padded | `05` |
+| `%p` | AM or PM | `PM` |
+| `%r` | 12h time (`%I:%M:%S %p`) | `01:07:05 PM` |
+| `%R` | 24h time, hours + minutes | `13:07` |
+| `%T` | 24h time, full | `13:07:05` |
+| `%F` | Date (`%Y-%m-%d`) | `2026-09-01` |
+| `%D` | Date (`%m/%d/%y`) | `09/01/26` |
+| `%u` | Day of week, **Mon=1 … Sun=7** (ISO 8601) | `2` |
+| `%w` | Day of week, **Sun=0 … Sat=6** | `2` |
+| `%c` | Locale-preferred date + time | `Tue Sep  1 13:07:05 2026` |
+| `%%` | Literal `%` | `%` |
+| `%n` | Newline | `\n` |
+| `%t` | Tab | `\t` |