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-% RWT_ADD(3ADVTRAINS) | Advtrains Developer's Manual
+---
+title: 'rwt_add(3advtrains)'
+manual: 'Advtrains Developer''s Manual'
+---
-# NAME
+# Name
`add`, `diff`, `sub` - Add or subtract railway time objects
-# SYNOPSIS
+# Synopsis
* `add(t1, t2)`
* `diff(t1, t2)`
* `sub(t1, t2)`
-# DESCRIPTION
+# Description
* `add()` returns the result of adding `t1` and `t2`.
* `diff()` returns the result of subtracting `t1` from `t2`.
* `sub()` returns the result of subtracting `t2` from `t1`.
-# RETURN VALUE
+# Return Value
`add()` and `sub()` return their results as tables. `diff()` returns its result as a number.