Discussion of 近代 [jìn dài] modern times - Trainchinese

1 - Is 近代 usually used in formal or informal contexts? (jìn dài) 2 - “当代“ versus “近代“: “当代“ (dāngdài) specifically refers to the current times or the present era, while “近代“ (jìndài) generally encompasses a broader span of history, typically referring to the modern or recent historical period, often ending before the contemporary era. “当代“ refers to the contemporary era or the current times. It pertains to the period of time in which one is currently living, representing the present age or the modern-day. Example: “当代科技发展迅速。“ (Dāngdài kējì fāzhǎn xùnsù.) - “Contemporary technology is developing rapidly.“ “近代“ refers to the modern or recent historical period, particularly the era from the late Ming and Qing dynasties in China (approximately 17th to early 20th centuries), or it can refer to a similar recent historical period in other contexts. Example: “近代中国经历了很多变革。“ (Jìndài Zhōngguó jīnglìle hěnduō biàngé.) - “Modern China has experienced many changes in recent history.“ 3 - What are some synonyms for 近代? (jìn dài)

1 - '近代'一词通常用于正式或非正式语境中吗？
2 - '当代'与'近代'之辨：'当代'（dāngdài）特指现时代或当下时期，而'近代'（jìndài）通常涵盖更广阔的历史跨度，通常指现代或近期历史时期，通常在当代时期之前结束。'当代'指代现时代或当下时期，涉及的是人们目前生活的时代，代表着现时代或现代。例如：‘当代科技发展迅速。’（Dāngdài kējì fāzhǎn xùnsù。）‘Contemporary technology is developing rapidly.’
'近代'指代现代或近期历史时期，特别是在中国的晚明和清王朝时期（约17世纪至20世纪初），或在其他语境中指类似近期历史时期。例如：‘近代中国经历了很多变革。’（Jìndài Zhōngguó jīnglìle hěnduō biàngé。）‘Modern China has experienced many changes in recent history.’
3 - '近代'有哪些同义词？