Meaning of jīn:
今
now
Wǒmen yīnggāi zhēnxī jīntiān de shíguāng.
我们应该珍惜今天的时光。
We should cherish the time we have now.
the present time; this (day, year etc)
Jīn tiān de tiānqì hěn hǎo, wǒmen kěyǐ qù gōngyuán.
今天的天气很好,我们可以去公园。
The weather today is nice, we can go to the park.
Wǒmen jīntiān yào qù gōngyuán.
我们今天要去公园。
We are going to the park today.
current; contemporary
Jīn tiān shì xīng qī wǔ.
今天是星期五。
Today is Friday.
Jīntiān de diànyǐng hěn jīngcǎi.
今天的电影很精彩。
Today's movie was very exciting.