Time flies. 光阴似箭。
Time is money. 时间就是金钱。
Time and tide wait for no man. 岁月不待人。
Time lost cannot be won again. 时光一去不复返。
Time flies never to be recalled. 光阴一去不复返。
To save time is to lengthen life. 节约时间就是延长生命。
No one can call back yesterday. 昨日不会重现。
An hour in the morning is worth two in the evening. 一日之计在于晨。