Thank you for sending me in the right direction. I tried testing for conflicts but nothing seemed to work. It was then that I looked in Events > Help > System Information and I realised that the WP Time and Date format for the whole site was messed up somehow. After resetting it to default in general WP settings everything has been resolved.
Usually, the simplest explanation is the right one. Thank you for your help.
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This reply was modified 6 years, 6 months ago by Phillip Bell.
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This reply was modified 6 years, 6 months ago by Phillip Bell.