Short history on Philippine metrication:
Pre-1858 Measurement systems in Philippines reflects diversity of regional inhabitants.
1858 Spain adopts metric system and introduces the metric system to the Philippines.
1865 Philippine monetary system shifts to decimal.
1905 Philippines lightly shifts to English system introduced by USA.
8/29/1916 Philippines adopts metric system after Philippine Autonomy Act signed.
1916-1975 Various measurement systems employed with metric system being prominent.
1/1/1975 Date set for sole metric system use via Presidential Decree No. 187.
7/16/1975 Presidential Decree No. 748 amends PD No. 187 to extend metrication efforts.
1/1/1983 Philippines officially adopts the metric system via Batas Pambansa Bilang 8.
4/13/1992 Philippine use of metric system reinforced via Republic Act 7394.
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