It is quite "challenging" to change the time manually (see below). Having a NTP server for your ACI Fabric is mandatory, because it syncs the time on all devices.
Before doing any manual change, just want to highlight: my advise is to stick with NTP and do not change the time manually.
Anyway, if I remember correctly you can change the clock manually using the root user. But for that you need the root password from TAC. Or contact your local cisco representatives and ask them to generate a root password for you. You just need to provide them with the token:
apic1# acidiag dbgtoken
Note: After generating the token, you have around 1h to get the password and use it.
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