AM
Ante Meridiem (before noon)

PM
Post Meridiem (after noon)

UTC
Coordinated Universal Time

GMT
Greenwich Mean Time

EST
Eastern Standard Time

CST
Central Standard Time

MST
Mountain Standard Time

PST
Pacific Standard Time

DST
Daylight Saving Time

HR
Hour

MIN
Minute

SEC
Second

YTD
Year-to-Date

Q1, Q2, Q3, Q4
Quarter 1, Quarter 2, Quarter 3, Quarter 4 (of a financial year)

FY
Fiscal Year

BCE
Before Common Era

CE
Common Era