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For each operator and LHS type, we define two lists: valid types and convertible types. The list of convertible types is based on Type Conversionconversion. This creates three cases:
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| SIL type | Index Value | Get | Get Return Type | Set |
|---|---|---|---|---|
| string | a number | Gets the character at the specified index in the string | string | Inserts a character at the specified index. If given a longer string, it will insert the first character of the string. |
| date | "DAY" | Gets the day of month from the date | number | Unsupported |
| "MONTH" | Gets the month from the date | number | Unsupported | |
| "YEAR" | Gets the year from the date | number | Unsupported | |
| "HOUR" | Gets the hour (0-23) from the date | number | Unsupported | |
| "MINUTE" | Gets the minute (0-59) from the date | number | Unsupported | |
| "SECOND" | Gets the seconds (0-59) from the date | number | Unsupported | |
| "MILLISECOND" | Gets the milliseconds (0-999) from the date | number | Unsupported | |
| "WEEK" | Gets the week number within the current year | number | Unsupported | |
| "WEEKINMONTH" | Gets the week number within the current month | number | Unsupported | |
| "TOMILLIS" | Gets the current time as UTC milliseconds from the epoch. | number | Unsupported | |
| "DAYOFWEEK" | Gets the three letter format for the day of the week (e.g. "Mon", "Tue", "Wed" etc) | string | Unsupported | |
| "MONTHNAME" | Gets the three letter format for the name of the month (e.g. "Jan", "Feb", "Mar", etc.) | string | Unsupported | |
| interval | "WEEK" | Gets the number of whole weeks inside the interval (e.g. interval i = "1w 14d"; i["WEEK"] will return 3) | number | Unsupported |
| "DAY" | Gets the number of whole days inside the interval (e.g. interval i = "1d 48h"; i["DAY"] will return 3) | number | Unsupported | |
| "HOUR" | Gets the number of whole hours inside the interval (e.g. interval i = "1h 120m"; i["HOUR"] will return 3) | number | Unsupported | |
| "MINUTE" | Gets the number of whole miuntes inside the interval (e.g. interval i = "1m 120s"; i["MINUTE"] will return 3) | number | Unsupported | |
| "SECOND" | Gets the number of seconds inside the interval (e.g. interval i = "1h 1m 3s"; i["SECOND"] will return 3) | number | Unsupported | |
| "TOMILLIS" | Gets the number of milliseconds inside the interval | number | Unsupported |