# Is Datetimes arithmetic still not supported on njit mode?

**URL:** <https://numba.discourse.group/t/is-datetimes-arithmetic-still-not-supported-on-njit-mode/2327>\
**Category:** Support: How do I do ...?\
**Created:** [December 15, 2023, 6:34am UTC](https://numba.discourse.group/t/is-datetimes-arithmetic-still-not-supported-on-njit-mode/2327 "2023-12-15T06:34:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aeyou](https://yyz2.discourse-cdn.com/free1/user_avatar/numba.discourse.group/aeyou/32/1041_2.png) [@aeyou](https://numba.discourse.group/u/aeyou)\
**Post date:** [December 15, 2023, 6:34am UTC](https://numba.discourse.group/t/is-datetimes-arithmetic-still-not-supported-on-njit-mode/2327/1 "2023-12-15T06:34:28Z")

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I would like to do this  
`@njit def ts_minus(ts_arr1, ts_arr2): return ts_arr1 - ts_arr2`  
and my ts\_arr1 and ts\_arr2 are `np array` of `datetime64[ns]`.  
The error is

 ![image](https://global.discourse-cdn.com/free1/uploads/numba/original/1X/c811f7efbbceadd3c644a16d090887880b55a8a1.png)  
Thank you very much.

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<div class="post-metadata">

**Author:** ![aeyou](https://yyz2.discourse-cdn.com/free1/user_avatar/numba.discourse.group/aeyou/32/1041_2.png) [@aeyou](https://numba.discourse.group/u/aeyou)\
**Post date:** [December 15, 2023, 6:35am UTC](https://numba.discourse.group/t/is-datetimes-arithmetic-still-not-supported-on-njit-mode/2327/2 "2023-12-15T06:35:31Z")

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my ts\_arr1 looks like

 ![image](https://global.discourse-cdn.com/free1/uploads/numba/original/1X/24d2e7f3a76527012c650d4fcb69d47335b32087.png)