HELP with Grammar please

[Overseasmom100]

you will find it in this week's Northern Times
or
you will find it in this weeks Northern Times

apostrophe???

Apostrophe - it's the Northern Times 'belonging' to this week.

Yes, you do need an apostrophe.

apostrophe required as it's the Northern Times that belongs to this week.

The first one.

Yes, apostrophe

Thank you wonderful Mumsnetters!