"Whatever you can do today, don't postpone it to tomorrow"
- This common Chinese saying may had the same origin as the quote in the question:
"Don't put off till tomorrow what you can do today."
This phrase is so common, it is in grade school textbooks
- The idiom 坐言起行 express a similar sentiment in a stronger sense.
Once decided, act immediately; When plan is formulated, implement it without delay
- There's also a common Chinese expression expressing the similar sentiment
"Pick the flower when it is time , (don't wait til there's no flower but stem left to be picked.)"
Gold Linen Jacket (seven words Yuefu poem)
"You should not cherish gold linen jacket, you should cherish youthful days."
"Pick flower when it blooms, don't wait til there's no flower but stem left to be picked."
Author: Du Qiuniang
Side note :
A completely opposite sentiment expressed in another poem is also very famous.
"Drink when you have wine today, (worry about tomorrow's problems when tomorrow comes)"