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+# Functions Reference
+
+## Global Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `date()` | `date(string): date` | Parse string to date. Format: `YYYY-MM-DD HH:mm:ss` |
+| `duration()` | `duration(string): duration` | Parse duration string |
+| `now()` | `now(): date` | Current date and time |
+| `today()` | `today(): date` | Current date (time = 00:00:00) |
+| `if()` | `if(condition, trueResult, falseResult?)` | Conditional |
+| `min()` | `min(n1, n2, ...): number` | Smallest number |
+| `max()` | `max(n1, n2, ...): number` | Largest number |
+| `number()` | `number(any): number` | Convert to number |
+| `link()` | `link(path, display?): Link` | Create a link |
+| `list()` | `list(element): List` | Wrap in list if not already |
+| `file()` | `file(path): file` | Get file object |
+| `image()` | `image(path): image` | Create image for rendering |
+| `icon()` | `icon(name): icon` | Lucide icon by name |
+| `html()` | `html(string): html` | Render as HTML |
+| `escapeHTML()` | `escapeHTML(string): string` | Escape HTML characters |
+
+## Any Type Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `isTruthy()` | `any.isTruthy(): boolean` | Coerce to boolean |
+| `isType()` | `any.isType(type): boolean` | Check type |
+| `toString()` | `any.toString(): string` | Convert to string |
+
+## Date Functions & Fields
+
+**Fields:** `date.year`, `date.month`, `date.day`, `date.hour`, `date.minute`, `date.second`, `date.millisecond`
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `date()` | `date.date(): date` | Remove time portion |
+| `format()` | `date.format(string): string` | Format with Moment.js pattern |
+| `time()` | `date.time(): string` | Get time as string |
+| `relative()` | `date.relative(): string` | Human-readable relative time |
+| `isEmpty()` | `date.isEmpty(): boolean` | Always false for dates |
+
+## Duration Type
+
+When subtracting two dates, the result is a **Duration** type (not a number). Duration has its own properties and methods.
+
+**Duration Fields:**
+| Field | Type | Description |
+|-------|------|-------------|
+| `duration.days` | Number | Total days in duration |
+| `duration.hours` | Number | Total hours in duration |
+| `duration.minutes` | Number | Total minutes in duration |
+| `duration.seconds` | Number | Total seconds in duration |
+| `duration.milliseconds` | Number | Total milliseconds in duration |
+
+**IMPORTANT:** Duration does NOT support `.round()`, `.floor()`, `.ceil()` directly. You must access a numeric field first (like `.days`), then apply number functions.
+
+```yaml
+# CORRECT: Calculate days between dates
+"(date(due_date) - today()).days"                    # Returns number of days
+"(now() - file.ctime).days"                          # Days since created
+
+# CORRECT: Round the numeric result if needed
+"(date(due_date) - today()).days.round(0)"           # Rounded days
+"(now() - file.ctime).hours.round(0)"                # Rounded hours
+
+# WRONG - will cause error:
+# "((date(due) - today()) / 86400000).round(0)"      # Duration doesn't support division then round
+```
+
+## Date Arithmetic
+
+```yaml
+# Duration units: y/year/years, M/month/months, d/day/days,
+#                 w/week/weeks, h/hour/hours, m/minute/minutes, s/second/seconds
+
+# Add/subtract durations
+"date + \"1M\""           # Add 1 month
+"date - \"2h\""           # Subtract 2 hours
+"now() + \"1 day\""       # Tomorrow
+"today() + \"7d\""        # A week from today
+
+# Subtract dates returns Duration type
+"now() - file.ctime"                    # Returns Duration
+"(now() - file.ctime).days"             # Get days as number
+"(now() - file.ctime).hours"            # Get hours as number
+
+# Complex duration arithmetic
+"now() + (duration('1d') * 2)"
+```
+
+## String Functions
+
+**Field:** `string.length`
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `contains()` | `string.contains(value): boolean` | Check substring |
+| `containsAll()` | `string.containsAll(...values): boolean` | All substrings present |
+| `containsAny()` | `string.containsAny(...values): boolean` | Any substring present |
+| `startsWith()` | `string.startsWith(query): boolean` | Starts with query |
+| `endsWith()` | `string.endsWith(query): boolean` | Ends with query |
+| `isEmpty()` | `string.isEmpty(): boolean` | Empty or not present |
+| `lower()` | `string.lower(): string` | To lowercase |
+| `title()` | `string.title(): string` | To Title Case |
+| `trim()` | `string.trim(): string` | Remove whitespace |
+| `replace()` | `string.replace(pattern, replacement): string` | Replace pattern |
+| `repeat()` | `string.repeat(count): string` | Repeat string |
+| `reverse()` | `string.reverse(): string` | Reverse string |
+| `slice()` | `string.slice(start, end?): string` | Substring |
+| `split()` | `string.split(separator, n?): list` | Split to list |
+
+## Number Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `abs()` | `number.abs(): number` | Absolute value |
+| `ceil()` | `number.ceil(): number` | Round up |
+| `floor()` | `number.floor(): number` | Round down |
+| `round()` | `number.round(digits?): number` | Round to digits |
+| `toFixed()` | `number.toFixed(precision): string` | Fixed-point notation |
+| `isEmpty()` | `number.isEmpty(): boolean` | Not present |
+
+## List Functions
+
+**Field:** `list.length`
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `contains()` | `list.contains(value): boolean` | Element exists |
+| `containsAll()` | `list.containsAll(...values): boolean` | All elements exist |
+| `containsAny()` | `list.containsAny(...values): boolean` | Any element exists |
+| `filter()` | `list.filter(expression): list` | Filter by condition (uses `value`, `index`) |
+| `map()` | `list.map(expression): list` | Transform elements (uses `value`, `index`) |
+| `reduce()` | `list.reduce(expression, initial): any` | Reduce to single value (uses `value`, `index`, `acc`) |
+| `flat()` | `list.flat(): list` | Flatten nested lists |
+| `join()` | `list.join(separator): string` | Join to string |
+| `reverse()` | `list.reverse(): list` | Reverse order |
+| `slice()` | `list.slice(start, end?): list` | Sublist |
+| `sort()` | `list.sort(): list` | Sort ascending |
+| `unique()` | `list.unique(): list` | Remove duplicates |
+| `isEmpty()` | `list.isEmpty(): boolean` | No elements |
+
+## File Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `asLink()` | `file.asLink(display?): Link` | Convert to link |
+| `hasLink()` | `file.hasLink(otherFile): boolean` | Has link to file |
+| `hasTag()` | `file.hasTag(...tags): boolean` | Has any of the tags |
+| `hasProperty()` | `file.hasProperty(name): boolean` | Has property |
+| `inFolder()` | `file.inFolder(folder): boolean` | In folder or subfolder |
+
+## Link Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `asFile()` | `link.asFile(): file` | Get file object |
+| `linksTo()` | `link.linksTo(file): boolean` | Links to file |
+
+## Object Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `isEmpty()` | `object.isEmpty(): boolean` | No properties |
+| `keys()` | `object.keys(): list` | List of keys |
+| `values()` | `object.values(): list` | List of values |
+
+## Regular Expression Functions
+
+| Function | Signature | Description |
+|----------|-----------|-------------|
+| `matches()` | `regexp.matches(string): boolean` | Test if matches |