Acroprint TQ600 (software version 4.x and above) - Manual (Page 40)

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Daylight Savings Time (DST)
DST, also called Daylight Saving Time, is the practice of temporarily
advancing clocks during the summertime so that evenings have more
daylight and mornings have less. It has been introduced as a method of
saving energy. Typically clocks are adjusted forward one hour near the start
of spring and are adjusted backward in autumn. DST is currently observed in
many countries, details vary by location.
1) Press OK to enter the DST setting
interface. Press Y to enable DST, and then
press OK to save. Selecting N disables DST.
2) Set the date mode for DST, there are two options, Mode1 and Mode 2
Mode 1: The default setting of the device. Its time format is shown as
“Month-day hour: minute”.
Mode 2: Its time format is shown as "Month-Weeks-week hour: minute".
After setting, press ESC button, the device will prompt you to save, press
OK to save and quit.
3) After you select the time format, you need to set the start and end time
of DST. The allowed range is 1-16 for the number of weeks (WS), 1 means
the first week, 2 means the second week, etc. The allowed range is 0-06 for
each day of the week (WK), if you input 0, it represents the Sunday, 1
represents Monday, etc.
If we take 4:00 am on September 1, 2008 (Saturday, the first week in
September 2008) as an example, the two display Modes need to be
configured as follows: