整天【zhěng tiān】
all day; all day long; day and night; the whole day
[名] 全天

他整天都在忙工作的事,连饭都顾不上吃。
He is too busy working to have meals all day long.
正【zhēng, zhèng】
(zhēng) 1. 1st month of lunar year (zhèng) 2. just; now 3. straight; upright
(zhēng) [名] 1、农历一年的第一个月。简称“正” (zhèng) [副]2、表示动作在进行中或某种状态在延续 [形] 3、垂直或符合标准方向

正月的第一天是中国农历的新年。
The first day of January on the lunar calendar is the Chinese Lunar New Year.

学生们正在上课。
The students are having a lesson right now.

这栋房子的大门朝正南方。
The gate of the house faces south.