wartime
Refers to the period during which a war is being fought. Often used in compounds like 戦時中 (during the war) or in contrast with 平時 (peacetime).
During the war, many people suffered from food shortages.
International wartime law sets the rules for warfare.
During wartime, people's daily lives were subject to many restrictions.
Supplies ran short during the war.
The government put a wartime system in place.
戦時 means 'during the war' whereas 戦後 means 'after the war', so the two periods do not overlap.
Compound of 戦 (war, battle) and 時 (time, period).
wartime economy