@melben you can't do it on that type of phone
read this (out of the techbulletin 87)
3.3 System Phone Date and Time Change
DS 5410/5420 and IP 5610/5620 telephones programmed to ‘System Phone’ now have the ability to change the date and time of the IP Office. To enable this feature, the system phone must dial *9000* then press the ‘hold’ button after hearing the confirmation beep. The display will now show Date and Time. The date can be entered by Day/Month/Year (16/05/2007) or Month/Day/Year (05/16/2007) dependant on system Locale.
E.g. enter date 16/05/2007 press 1, 6, #, 0, 5, #, 2,0,0,7 from the System Phone.
E.g. enter time 14:05 press 1, 4, #, 0, 5 from the System Phone.
ACA - Implement IP Office
ACA - Voice Services Management
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Women and cats can do as they please and men and dogs should relax and get used to the idea!