import time

# 字符串转换为时间戳
timeArray = time.strptime("2021-03-19 10:00:00", "%Y-%m-%d %H:%M:%S")
timeStamp = int(time.mktime(timeArray))

# 时间戳转换为字符串
timeArray = time.localtime(timeStamp)
timeStr = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)

print("时间戳：", timeStamp)
print("字符串：", timeStamp)

输出：

时间戳： 1616119200
字符串： 1616119200