和字硬币是中国人民银行自2009年起陆续发行的一套主题系列硬币，其设计理念体现了中国传统文化精髓，其中的“和”字取自《和为贵》一文，强调和谐、和气、和睦。和字硬币已经成为了收藏界的新宠，也备受普通民众喜爱。

在发行时间上，和字硬币自2009年开始发行，至今已经发行了五枚。具体发行时间如下：

2009年和字硬币：2009年10月6日发行，直径30毫米，面值为1元。

2010年和字硬币：2010年11月9日发行，直径30毫米，面值为1元。

2013年和字硬币：2013年9月23日发行，直径30毫米，面值为1元。

2014年和字硬币：2014年6月4日发行，直径30毫米，面值为1元。

2015年和字硬币：2015年6月19日发行，直径30毫米，面值为1元。

从发行时间可以看出，和字硬币每年都有不同的设计和图案，并且在每年的6月至7月间进行兑换。由于其设计精美、图案独特、题材寓意深刻，因此和字硬币在市场上备受追捧，尤其是一些特殊年份或版式的硬币更是一枚难求。

英文分析：

When will the Hezi coins be issued?

The Hezi coins are a series of themed coins issued by the People's Bank of China since 2009. The design concept of the Hezi coins reflects the essence of Chinese traditional culture, with the "He" character taken from the article "Harmony is precious", emphasizing harmony, amity, and peace. The Hezi coins have become a new favorite in the coin collecting community and are also well-loved by the general public.

In terms of the issue date, the Hezi coins have been issued since 2009 and five coins have been issued so far. The specific issue dates are as follows:

2009 Hezi coin: Issued on October 6, 2009, with a diameter of 30 mm and a face value of 1 yuan.

2010 Hezi coin: Issued on November 9, 2010, with a diameter of 30 mm and a face value of 1 yuan.

2013 Hezi coin: Issued on September 23, 2013, with a diameter of 30 mm and a face value of 1 yuan.

2014 Hezi coin: Issued on June 4, 2014, with a diameter of 30 mm and a face value of 1 yuan.

2015 Hezi coin: Issued on June 19, 2015, with a diameter of 30 mm and a face value of 1 yuan.

It can be seen from the issue dates that the Hezi coins have different designs and patterns each year, and can be exchanged between June and July every year. Because of their exquisite design, unique patterns, and profound themes, the Hezi coins are highly sought after in the market, especially some special-edition or variant coins that are difficult to find.