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---
titles:
- rwt_add
- rwt_diff
- rwt_sub
section: 3advtrains
manual: 'Advtrains Developer''s Manual'
shortdesc: add or subtract railway time objects
---
# Synopsis
* `add(t1, t2)`
* `diff(t1, t2)`
* `sub(t1, t2)`
# 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
`add()` and `sub()` return their results as tables. `diff()` returns its result as a number.
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