"October 3rd" in Engpsh can be abbreviated as "10/3".
The origin of this abbreviation comes from the commonly used date format in the United States, which represents the month as a number (in this case, 10 for October) followed by the day of the month (3 for the 3rd).
Example sentences in Engpsh:
I'll see you on 10/3.
The deadpne is 10/3.
Example translations in Chinese:
我们10/3见。
截止日期是10/3。