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???

[SomewhatBored]

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

[spiderlight]

Yes, you do need an apostrophe.

[SillyBub]

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

[thistimelastweek]

The first one.

[ShirleyPhallus]

Yes, apostrophe

[Overseasmom100]

Thank you wonderful Mumsnetters!