Yealink W60P Administrator's Manual page 198

Administrator's Guide for W60P DECT IP Phones
Parameters
Day of Week: 1=Monday, 2=Tuesday,..., 7=Sunday
Hour of Day: 0=0am, 1=1am,..., 23=11pm
Example:
local_time.start_time = 1/1/7/0
Note: It works only if the value of the parameter "local_time.summer_time" is set to 1
(Enabled).
Web User Interface:
Settings->Time & Date->Start Date
Handset User Interface:
None
local_time.end_time
Description:
Configures the ending time of the Daylight Saving Time (DST).
Value formats are:
Month/Day/Hour (for DST by Date)

Month/Week of Month/Day of Week/Hour of Day (for DST by Week)

If "local_time.dst_time_type" is set to 0 (DST by Date), use the mapping:
Month: 1=January, 2=February,..., 12=December
Day: 1=the first day in a month,..., 31= the last day in a month
Hour: 0=0am, 1=1am,..., 23=11pm
Example:
local_time.start_time = 12/12/22
If "local_time.dst_time_type" is set to 1 (DST by Week), use the mapping:
Month: 1=January, 2=February,..., 12=December
Week of Month: 1=the first week in a month,..., 5=the last week in a month
Day of Week: 1=Monday, 2=Tuesday,..., 7=Sunday
Hour of Day: 0=0am, 1=1am,..., 23=11pm
Example:
local_time.start_time = 4/3/2/3
Note: It works only if the value of the parameter "local_time.summer_time" is set to 1
(Enabled).
Web User Interface:
Settings->Time & Date->End Date
Handset User Interface:
178
Permitted Values
Time
Default
12/31/23