安装日期 meaning in English

installation date

Verification of date of original installation
初始安装日期的查证。
When returning component part ( s ) , they must be individually tagged and identified with the water heater ' s model number , serial number and date of installation
部件退货，应该分别标记和标示热水器的型号，系列号和安装日期。
When owner cannot verify or document the original date of installation , the warranty period begins on the date marked on the serial number plate affixed to the water heater
如果“所有人”无法证明或提供初始安装日期的证明文件，则质量保证期按照附在热水器上的系列号板所标注的日期计算。